We need to be talking about the political implications of what we've built, and figuring out how to fix our mess. This is like the period before the hurricane: everyone should be busy boarding up windows, and you can't do that if you decide you're just not going to talk about the coming storm because it makes you feel bad.
Silence assists certain forms of repression.
I was pretty let down that HN did not do more to protect political discussions during the US election cycle and I really didn't see all that much vitriolic behavior in the first place. Even if there is bad behavior though, is that something that we need to be protected from at all times? Maybe it is better to let it happen, point it out when we see it, and then hopefully learn to discuss more civilly as a community in the future.
I also think that specific flags would help, i.e. flag a comment that is against some guideline, with reference to the rule it broke.
One of the worst fallacies, us probably the kind that removed the civility from a discussion, and hence the good faith.
As a side note, the worst kinds of guideline is an ambiguous one, that leaves a lot to interpretation, e.g "act civil" is itself a nice rule, but otherwise useless, better off as a heading above specific clarifications.
HN doesn't need to be Wikipedia wrt comment rules, but a few Wikipedia style rules might be good.