Do you think it is appropriate for someone to type "KYS" or "Kill Yourself" in game?
Me personally, I don't like when people say this. I’ve dealt with horrid depression for a large chunk of my life. But I still slip up and say it sometimes and I always regret it, I'm not proud of it.
All this to say, bZ doesn't restrict its use, nor do we have any plans to do so anytime in the near future. I will not allow my personal beliefs to interfere with that, just like many other things. So, go for it, but just don't go overboard with it (just like anything else).