You neglected to include a good argument in favor of slavery.
Some people aren't intelligent enough/don't have high enough time preferences to function in modern society. Thus you either need to have them under the control of a master, or you wind up having to put them on the public dole and institutionalize the many of them anyway.
Stop hyper-focusing on individual words to try to score debating points when the intent behind their use is clear from the context, everybody on LessWrong.
There were good arguments for all of those things when they were still in use. There are no good Arguments today for favoring Aristotelian physics over Newtonian physics, Ptolemaic over Copernican, or the phlogiston theory over the oxygen theory, where an Argument means a complete consideration of the evidence and the individual arguments.
I'm not trying to score debating points. I have a serious poin...
Slavery, suffrage, Christianity or Prohibition aren't right or wrong in some objective non-moral sense. Arguments for or against such things are inevitably about convincing people, not about some objective truth.
Well three of those four things are essentially government/societal policies, and one can argue about what the consequnces of adopting or not adopting those policies are.
...Let's test your idea that "There are no good arguments for X" is simply how having a successful social taboo against X feels from inside:
"There are no good arguments for the phlogiston theory of chemistry" is simply how having a successful social taboo against the phlogiston theory of chemistry feels from inside.
"There are no good arguments for Ptolemaic astronomy" is simply how having a successful social taboo against Ptolemaic astronomy feels from inside.
"There are no good arguments for Aristotelian physics" is si
Ideally, I would estimate the negative effects: how many people would later learn I lied and abandon my cause, and how enemies of the cause might use the fact I lied against it, and the reputational harm to my other causes and to my allies.
Not to mention the damage the people who believe your lies might do by acting on them.
What might be the cause of the perceived difference between the atheists/nontheists in Europe and in the USA?
Where in Europe? Richard Dawkins is from England and organized things like the infamous atheist bus campaign.
Also numerous European countries used to have atheist militants, of the priest-killing or at least send-priests-to-labor-camps variety.
Both Western governments and countries like Sierra Leone and Saudi Arabia. If he's simply talking bullshit why do government seek him out as a highly-payed advisor?
Because the official who made the proposal gets to look good for consulting with someone high status. There's a reason consultants have the reputation they do in the business world and governments have even worse internal incentive problems.
There are no pure-blooded aryans here. There are no pure-bloods at all.
There's also no such thing as 100% pure water, that doesn't mean "water" or even "fresh water" is a meaningless or "socially constructed" concept, and it definitely doesn't mean it's a good idea to drink a glass of sea water.
There's far more difference between a black-skinned person whose ancestors have lived in America for five generations and a black-skinned person whose ancestry remains rooted in Africa, than there is between the black-skinned American and a white-skinned American
Genetics science says otherwise. Or do you believe that genes have no impact on who someone is?
Am I from a small tribe in Polynesia because I have an unusual crown formation? Maybe I'm American Indian because of the way my roots wrap around my jawbone?
I don't know, are you? You can trace your ancestry or get genetic tested if your curious.
But what's going on here is just our old familiar dilemma of justice vs. truth. It SHOULDN'T be profitable to use someone's skin color as a quick proxy for what's inside their heads. That would be monstrously unfair. People can't help their skin color.
People largely can't help what's inside their head either.
Can rationality be lost?
Sure, when formerly rational people declare some topic of limits to rationality because they don't like the conclusions that are coming out. Of course, since all truths are entangled that means you have to invent other lies to protect the ones you've already made. Ultimately you have to lie about the process of arriving at truth itself, which is how we get to things like feminist anti-epistomology.
and all our heuristics on beliefs about non-trivial groups say - don't have them, and certainly don't say them out loud.
Of course, if you refuse to discuss race and crime, someone will point out that more blacks get arrested than whites and claim that this is due to police racism. More generally, once you start lying the truth is ever after your enemy.
For example, you may have heard that social science is in the midst of a replication crisis, well there is one area of social science where that isn't the case, namely IQ research and its correlates. Of ...
He answered that he doesn't have any strong spiritual experiences and most of his classmates also haven't. A few have and he considered them a bit strange because they were than also serious about things like no-sex-before-marriage.
This person sounds like an atheist who wants to cosplay as religious and considers the people who are actually religious to be "strange".
and more importantly the people with a political agenda, who stay.
Well, the political agenda is also a natural evolution. After getting laid enough times, it gets dull. Also if one is at all philosophically inclined, one notices that the very existence and need for PUA is a symptom of how dysfunction certain aspects of society are. Thus one is naturally led to politics.
Instead of getting told to force myself to do approaches that make me feel unconfortable I get told that it would be good for me to do more non-violent communication style expressions of my own desires.
So how does that actually help with seducing girls? Because that sounds like it simply decayed into yet another "generic self-help movement".
You'd be amazed what people can do "by hand". Keep in mind, computer was originally an occupation.
LOL. Wake up and smell the tea :-) People who want to push advertising into your eyeballs now routinely construct on-demand (as in, in response to a Google query) websites/blogs/etc. just so that you'd look at them and they get paid for ad impressions.
Are these things going to fool any actual human, or just Google's algorithms, i.e., that people see it in Google's searches, possibly click, but don't look at it any closer.
I feel I should point out that corrupt grading is easily detectable - one can often see it by looking at a corruptly graded paper,
Except who sees a paper except the grader and the student who wrote it?
Moreover, universities have a strong incentive to not be corrupt in their grading - if they let people slip through without learning the work, employers will start to notice and discount qualifications from that institution,
Empirically this incentive wasn't strong enough.
Well, in case you haven't noticed aren't in small forager tribes right now.
You're right, I left out a few alternatives. We could also deport them to a haunter-gatherer society, let them go around engaging in tribal-style raids (although that tends to interfere with the functioning of modern society for those who can function in it), or let them starve to death.