They make comics. Lots of comedy is about trying to find a balance between what is offensive and what people are willing to laugh at.

If you're creating humorous content, then you by necessity cross the boundary into the offensive (but you don't necessarily publish it!) as part of the creative process. Otherwise you'll never strike the best balance.

Consider this Onion post (NSFW) - http://www.theonion.com/articles/no-one-murdered-because-of-...

Now try to imagine what their work environment must be like.