They are juggling the "Free Speech" vs "Psycho Poster" dilemma. I'm sure they'll figure it out.
Well it is obviously irritating enough to the posters and admins that they felt the need to issue the warning, anyone guilty of it should probably heed the warning. I have seen many a poster ignore it and pay for it by being perm banned, I know, I am one of those and on more than one site.