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Unless it's real threats we try to ignore it. Usually it's people venting off because they are frustrated with real life, job (or lack of), idiots @ school and so on. Trying to do mental censorship all the time in order not to offend someone leads to bigger problems later. Always. Usually it is better to be "racist" now and then than to keep everything inside in order to pretend you get along with everyone -- which later erupts into something much more dangerous.
I noticed few times people got banned just because they had NIGGER or MUHAMMAD/OSAMA nickname. Don't do that, it's not what our servers stand for. We allow everything except real threats, revealing private info (home address, etc.), and obvious spam, for instance selling aimbots/hacks or aggressively promoting crappy websites. If someone wants others to check their web page, that's fine. Repeating it all the time is not. Bind-spam also can be annoying and player can be banned for it.
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About chat logs...
Servers do not log your chat -- in contrast to most game servers out there. Reason is, after logging Q3 for a bit of time years ago we realized chat logs are usually very stupid and annoying to read. Mostly it's people venting off or complaining, while others are trying to enjoy the game. So reading logs in order to get "feedback" is a very bad idea. Besides, we respect privacy and don't even want to know what you talk about.

And finally, fuck Social/Cultural Marxism also known as Political Correctness. If you don't know what that is, follow this link. You are most probably manipulated into it already, even if you hate ideas of that type.