Asked for an unban and it was ok within the minute.
HN just tries to reduce politics here, which is in their right.
Please state facts.
An extreme right party in Belgium looks for better benefits for the poor than Democrats in the US ( cfr. Vlaams Belang in Belgium, i'm not approving them btw)
Their party programme was based on Denmark.
The most extreme is currently in Hungary and he is hard against immigration, but that's it.
Whether this is on purpose (a system used by the mods to keep the site left-wing) or not (just a consequence of the times we live in + a desire by the mods not to have flames all day) is another matter.
The political compass can be separated in economical and social issues. Economically, HN is right-wing, as you say. It's full of libertarians. But socially, it's strictly left-wing. Things that get you flagged? Men and women are not the same, we should not turn the world around to appease to non-heterosexuals, perhaps people of different races/ethnic backgrounds/religions are fundamentally different (for better or for worse), all humans aren't worth the same, countries should have the right to manage themselves in any way they want without having human rights shoved into them by the west... Stuff like that cannot be discussed here.
And as I said, I don't know if it's a conscious effort by the mods, or those topics only incite flames so they have to be shut down. What I do know is that just yesterday we got https://news.ycombinator.com/item?id=21365411 on the front page (which is, quite literally, left-wing political propaganda) but something that criticised those points would be flagged in minutes.
That, and there are automated things which identify when a topic becomes flame
Older/active users are predominantly left-wing and use their flag power to flag right-wing points of view, because they deem them as trolling (charitable point of view) or because they want to silence them (uncharitable point of view). Then, mods come and ban those who amass many flags because someone who's got many flags is irredeemably a troll.
Obviously these examples are reductive by necessity, and both constructive and insubstantive/hateful posts can be reduced in these ways. Personally, the examples of such downvoted/flagged posts I've seen have almost always betrayed the latter quite unsubtly. (Your choice of wording is also kind of unfair - you've chosen reductions that are, again in my opinion, no-brainers to say "yes" to without context and assuming good faith).
Europeans - I am one so I know - if they are Anglos - are heavily influenced by the American information-sphere. It is normal for a European to listen to NPR or watch CNN and think they're hearing neutrality because there's context in American politics we're not aware of.
There is a conformity - I don't want to label it leftist - it leans there at the moment but it will go the other way in future.
It is not anybody in Silicon Valley's job to moderate the population's speech - that our governments did not produce a public space for the online world was a strategic error. I suppose we could just take the China route but no amount of machine learning is going to stop Americans telling the other side to fuck off - that is a feature and not a bug.