This is a very hard thing to broach....one hand says freedom of speech, the other says safe and hate-free environment...how far can the envelope be pushed before it's too far.
There have been a few posts on here by individuals which border on the "that's not OK" and at some point will garner the attention of someone who regulates such things (perhaps).
The internet can't be a free-for-all, it has to be regulated and controlled to some degree, I say this as there are so many predators, subversive group recruiters and conspiracy theorists out there to just let the internet police itself.
For the most part we police ourselves on this site as we are mainly more mature responsible people...if in some case we are unable to self-moderate, that's when we contact a moderator to step in and make the judgment call...we have to have that safety just like at a race track....it's not a free-for-all there either.