Even a single personal anecdote is good evidence when the claim in question is "basically everyone there is right-wing". As someone else mentioned, there are in fact readership surveys there every now and then, and guess what?, they also produce results wildly inconsistent with what you're claiming.

Here are some numbers from the 2019 survey (it's not the latest one but it's the latest whose results I could readily get at).

"Where do you think you fall on a classic political spectrum?" (1 = far left, 10 = far right). Most common result is 3, at 25.6%. Next most common is 4, at 20.6%. The "left half" 1-5 has about 66% of the responses. 2.2% are 1 (far left) versus 1.6% at 10 (far right).

"With which of these political descriptions do you most identify?" with 7 options (libertarian, conservative, liberal, social democratic, marxist, neoreactionary, alt-right; I have no idea why "socialist" wasn't an option). Largest group, at 31.8%, is "social democratic". Next, at 29%, is "liberal" (which of course is a term with many meanings, but it was clarified as "for example, the US Democratic Party"). Note that these two already constitute a majority. Next, at 21.6%, is "libertarian". Alt-right and neoreactionary between them look like they come to maybe 8% or so, which for sure is a lot relative to how many alt-rightists and neoreactionaries there are in the population at large, but it's still a small minority.

"American political parties", asking about registered affiliation: largest group is "not registered" at 35%, next is Democratic Party at 31%, next is "not American" at 20%, next is Republican Party at 10%, next is Libertarian Party at about 3%.

Some other politically-charged topics:

Global warming (1-5 from "requires strong action" to "does not require action"): 1>2>3>4>5, 1+2 at about 73%, 4+5 at about 13%.

Immigration (1-5 from "should be stricter" to "should be more open"): 1+2 at about 23%, 4+5 at about 50%.

Feminism (1-5 from "very unfavourable" to "very favourable"): 1+2 at about 29%, 4+5 at about 47%.

These do not indicate a community whose range of political views amounts, as you put it, to "right or hard-right".

It is a community with more extreme rightists than average. (8% neoreactionary + alt-right!) It is a community with more people willing to be negative about feminism than its general leftishness would suggest. (29% with unfavourable views of feminism. Not terribly different from the figure for the US as a whole in the 2016 survey at http://files.kff.org/attachment/topline-methodology-washingt... though.) It is a community with more tolerance for kinda-racist[1] "human biodiversity" views than average. (The survey asked about favourable/unfavourable views of "human biodiversity", clarified as "eg the belief that humans differ genetically in socially relevant ways", and the responses were pretty much symmetrically distributed.) So your perception that SSC is a wretched hive of scum and villainy isn't completely without basis in reality, but a better description would be "mostly reasonable and decent people, with something of a leftward lean overall -- but with a small contingent of sometimes very loud right-wing crazies, and more tolerance than most leftish places for some ideas beloved of right-wing crazies". Which might be enough to make you hate it, of course, but it's not the same thing as "almost entirely rightists" which is how you portrayed it.

[1] Only kinda-racist? Well, (a) it's possible to hold those views and also think that discrimination against (say) black people is stupid and evil, and I'm fairly sure some SSC commenters hold roughly that position, and (b) strictly speaking "differ genetically in socially relevant ways" is obviously true, because e.g. the colour of your skin is socially relevant if you live in a society with any racists in it. But if you'd prefer the "kinda-" deleted, I understand and I suggest you pretend I didn't write it. That won't much change my meaning.