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Well, I'd like to know where's the limit? Can people put lyrics of neo-nazi bands etc. to their sigs: "kill the jews"? Well, this attacks one group, so I guess it's not allowed.
The limit for me would be something which was not a statement made in the spirit of art, and was obviously intended to provoke hate towards a particular group, for no apparent reason, or without cause.
I'm a pretty flexible person, not easily offended, and I like to think that I'm open to other people's opinions, interests, wordviews etc. I like to cut people slack because I would hope they would do the same for me. Everyone has their quirks and their odd interests and really the only way for everyone to get along is to show some tolerance.
Heavy handed censorship is IMO worse than anything that could be brought about from some midly offensive content being portrayed.
I believe that there is a fundamental need to fight against falling into the trap of knee-jerk censorship. It's the easy way out, and it's more harmful in the end.
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What about some "death metal" or similar kind: "slaughter your neighbours, rip off their heads, eat the entrails of the weak ones, rape their dead bodies" -type of text. Or any kind of text as long as it's just not copyrighted..

Well first of all, I have a sneaking suspicion that you are already biased against death metal here, from your sweeping over generalization.
Every genre of music has content which can be extremely offensive to some groups, why single something like this out?
Anyway, addressing this more directly, I still wouldn't want to censor this. I don't see a need to do it. Again, it's not directed at a particular group of people, and just because it's unpleasant and offensive to some people, does not mean that it's necessarily "wrong" (let's not drag this out into a deep philosophical discussion)...
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What about avatars? Can somebody put a gif animation of Afgan rebels cutting the throat of russian soldier here, but not people making love?

Read my first response.
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Personally I would not like to see text like that here, just because different people have different limits. I've not seen any avatars yet which I would regard truely offending to most people imo.
Also any option to disable sigs or avatars doesn't affect the biggest visitor group here, guests...
I'm sorry, but I have little concern here. If someone isn't serious enough about the board to register, I'm not going to waste my time worrying about setting preferences for them. Quite simply, it's not my problem. They can fix it themselves if they like, that's good enough. I'm not here to hold everyone's hand and make sure that they are shielded from the evils of the world on HA and that their experience here is free from all unoffensive and oh-so-unbearable experiences in the world. People need to learn how to deal with this on their own. This happens to be my stance on censorship for the large part also. I'm against censorship when someone can just as easily choose to ignore something. Why must we "silence" someone else, just because it makes you a little bit uncomfortable in your seat? Granted, there are cases where this is warranted (as outlined first), but something like this is so far from that, I'm left wondering why we are even having this conversation in the first place.