[michaelt]

If someone believes in the principle of "I disapprove of what you say, but I will defend to the death your right to say it" they will naturally find themselves defending some pretty odious speech - and gaining the support of people who believe pretty odious things.

After all, a free speech advocate and a neo-nazi would both support the publication of Mein Kampf - but the former might well want to be clear they're not the latter. (and of course, to complicate the situation further, the latter may want to disguise themselves as the former)

As to why you see so many posters affirming they don't support Trump - that's because HN readers aren't Trump's target demographics: Trump only got 12% of the vote in San Francisco in 2020. IMHO it's believable that on HN, free speech advocates simply outnumber Trump supporters.