Unfortunately it might also be an area where epistemic and instrumental rationality clash. In fact, most of the world does not have freedom of speech in the same way the US does - if one advocated HBD in, say, Germany, could one be thrown in prison in the same way people are imprisoned for saying 'seig heil'?
There is a difference between advocating something and merely believing it. But I'm mostly skeptical of the people that put "strongly disagree" on that question. As opposed to "disagree" or "neutral". The fact that it's so correlated with political ideology is more evidence that it's just political bias.
If I lived 200 years ago, I wouldn't go around advocating atheism. But I might have believed it privately, and I would be more skeptical of the openmindedness of people that say they "strongly oppose the evils of atheism".
The study I am thinking of did account for this.
I really don't know. When I researched this it seems like the effects are pretty hard to estimate. Different models give very different results. A recentish study using more modern climate models shows that the effects would be catastrophic and last for multiple years:
https://en.wikipedia.org/wiki/Nuclear_winter#2007_study_on_global_nuclear_war
the products of a nuclear explosion have very short half-lives - the worst would be over within an hour. Not only do we not have enough bombs to contaminate the world, but ground zero would be habitable again after a few months.
Those first few months are the problem though. The crops and livestock die or absorb the radioactive isotopes. The people too if they don't happen to have a fallout shelter handy.
Also the nuclear bombs themselves aren't the only concern. You would have to deal with all the waste left in the cities they destroy. Nuclear power plants would melt down with no one to contain them. Vast amounts of chemical waste would leak from abandoned chemical plants and waste storage. Oil would leak and pollute the oceans with no cleanup.
I don't know how to estimate the damage of this. But it should be at least a bad or worse than major industrial accidents of the past, like Bhopal, deepwater horizon, or Chernobyl. But all happening at once and with no one left to organize any kind of response.
while I think a nuclear war between allmost all countries is unlikly, its still a lot more likly then 90% of humanity killed by environmental or political collapse.
I think you are underestimating the secondary effects. I imagine a complete destruction of the global economy. There isn't enough food to go around and lots of countries are starving. This would lead to more war and chaos.
A few thousand years ago the civilizations of the mediterranean all collapsed almost at once. It's now speculated to be the result of a serious drought and bad weather. The states that couldn't feed their population got overthrown, and their hungry populations went to war with neighboring countries for food, until nothing of the old orders remained. It was a serious setback for humanity.
If that happened in the modern world, technological civilization might end and never be restarted. The modern world depends on hugely complex infrastructure and tons of different industries and inputs. If we lose that, it would be very difficult to rebuild. We've already extracted most of the easy to get to minerals and fossil fuels. Much farmland has been degraded from overuse and depends on inputs of fertilizer, irrigation systems, and of course modern machinery which would be difficult to replace.
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Rather, the standard conservative argument against abortion, based on the fetus's right to life, isn't going to convince neo-reactionaries or fascists who don't believe in human rights. On the other hand, they might well be convinced by Margret Sanger-style arguments about aborting undesirables.
This is a good point, although I would partially agree with them - not only am I pro-choice, but I would strongly advice someone to abort if the child would have Down's syndrome for instance. It is the humane thing to do for all involved - you don't condemn a child to sickness and parents to possibly watching a child die before they do.