I didn't say being "uniquely human" is all that's required for something to be good - rather, that discarding such things entirely is certainly bad.
Having a bad back is uniquely human, too, as are male pattern baldness and HIV. Is discarding these things "certainly bad"?
I also notice you haven't actually corrected the begging-the-question problem: you still haven't established that bad feelings belong to the class of "uniquely human", and you certainly haven't established that being uniquely human is good.
If you go with "part of our nature" instead, then it's also part of our nature to be stupid and irrational, biased and fallacious. Shall we not discard those either?
And of course, you're still begging the question of why "part of our nature" equals "certainly bad" to "discard". Sickness is part of our nature; shall we not cure it? Must we linger in ill health for as long as our ancestors, instead of getting well more quickly?
If not, how is it different from getting over a bad emotion more quickly?
Your #2 is even more disappointing -- "what is actually good flows from our nature" -- WTF? That's as much begging the question as saying there must be a God because he's good, and all the good we have in the world must therefore flow from His love. You're just babbling here, not making a case for anything. It's good because good flows from our nature, and our nature is good because discarding it is bad? Perhaps it contains a dormative principle, too?
"what is actually good flows from our nature"... [is] begging the question
I wasn't aware we were arguing metaethics at that level here, so a charge of begging the question seems entirely out of line.
That what is good comes from the sort of thing that one is, is not all that controversial. It's actually one thing I didn't have to explain or defend at all in my thesis on ethics, but as always your panel may vary. Let's go through a few candidate explanations of the good:
It seems that LessWrong has a nascent political problem brewing. Firstly, let me re-iterate why politics is bad for our rationality:
Politics is especially bad for the community if people begin to form political factions within the community. Specifically, if LessWrong starts to polarize along a "feminist/masculinist" fault-line, then every subsequent debate will become a proxy war for the crusade between the masculinist jerks and the femenazis.
Alicorn has contributed in several ways to the emerging politicization of LessWrong. She has started name-calling against the other side ("Jerkitude" "disincentivize being piggish"), started to attempt to form a political band of feminist allies ("So can I get some help? Some lovely people have thrown in their support,"), implicitly asked these new allies to downvote anyone who disagrees with her position ("There is still conspicuous karmic support for some comments that perpetuate the problems"), and asks her faction to begin enforcing her ideas, specifically by criticising, ostracizing or downvoting anyone who engages in a perfectly standard use of langage and thought: modeling the generic human female as a mechanical system and using that model to make predictions about reality. She has billed this effort as a moral crusade ("unethical"). I am sure she isn't doing this on purpose: like all humans, her brain is hard-wired to see any argument as a moral crusade where she is objectively right, and to seek allies within the tribe to move against and oppress the enemy. [notice how I objectified her there, leaving behind the language of a unified self or person in favour of a collection of mechanical motivations and processes whose dynamics are partially determined by evolutionary pressures, and what a useful exercise this can be for making sense of reality]
We should expend extreme effort to nip this problem in the bud. As part of this effort, I will delete my account and re-register under a different username. I would recommend that Alicorn do the same. I would also recommend that anyone who feels that they have played a particularly large part in the debate on either side do the same, for example PJeby. That way, when we talk to each other next in a comment thread, we won't be treating the interaction as a proxy war in the great feminist/masculinist crusade, because we will be anonymous again.
I would also implore everyone to just not bring this issue up again. If someone uses language in a way that mildly annoys you (hint: they probably didn't do this on purpose), rather than precipitating a major community feud over it, just ignore it. The epistemic rationality of LessWrong is worth more than the gender ratio we have. A 95% male community that manages to overcome a whole host of problems in instrumental and epistemic rationality is worth more to the world than a 80% male community that is crippled by a blood-feud between a feminist faction and a masculinist faction.