Personally I find that people are already way too concerned about up and down voting, the internet should be a place that you speak your mind. Anything trying to restrict peoples ability to express their opinion is negative in nature. Sure idiots will stay stupid shit but the internet should still be a place you can freely voice your opinion. A mod can step in if people get really hateful, threatening or dangerous. People are way to concerned about causing offense, reading something online you don't agree with or like is a no harm no foul situation in my mind. People should not be shunned or silenced because someone may not like what they say.