> Healthy, well adjusted adults will not care if you are offended by their post history.
Healthy, well adjusted adults will care, because healthy well adjusted adults are possessed of empathy and the awareness of living within the norms and boundaries of social structures, and that the people they interact with online are actual people and not simply text in a box.
Having no internal filter and not caring about the effect you have on others is a sign of immaturity and sociopathy. It's the sort of internet fuckwad behavior most of us grow out of by the time we're no longer teenagers.
>Which is something I have thankfully not encountered oh HN.
And HN has exactly that kind of system, so you admit it works here. People are capable of discussing things outside of group consensus as well as respecting one another and being civil, and the fact that they do at all suggests the effect of downvoting, flagging and disengaging works to discourage bad behavior while not suppressing actual thought provoking or interesting discussion.