Whatever specified in question title ends up in the URL of the post.
As a result, if a question contains strong language in its title, there's a strong chance it won't be accessible by people behind Web filtering programs that block pages by looking at the URL.
Example (original revision):
I'm not proposing censorship of the title. I don't care whether the title is offensive or not. The issue is some idiot string matching programs that can be circumvented just by stripping a bunch of blacklisted words off the slug. Removing those, even if they were not offensive in that context, wouldn't harm anything.