Equally, a lot of the commentary here is against the idea that FB is having to make decisions about what is and is not hate speech. If there were the equivalent on HN i.e. dang et al pre-screened all comments and decided what was acceptable, I'm sure there'd be a backlash.
On HN, the community decides what is acceptable having seen the comment. In the FB case, the community has decided what is acceptable in general, via laws, but FB are being forced to police those laws without the community seeing the specifics. A subtle distinction I grant you but, in my opinion, an important one.
Having said all that, I can't disagree that the HN community is generally biased as it's self selecting. I personally don't have a problem with that (if I did there's a fairly straightforward fix) and I do expect to hold governments to a higher standard as it's much harder as an individual to fix the issue.