Whether you genuinely mean it or not, there are some things that it is never okay to say. Think carefully about this. People have feelings, and shaking them up for kicks is a very asshole thing to do.
For the record, telling all your classmates you wanted them to die is a VERY asshole thing to do. Don't be the asshole, the bad guy.
I understand what you said about 'trolling' for the sake of discussion, but you definitely went about that the wrong way. The idea of playing devil's advocate is not to offend other people by rudely stating an opinion that's fighting the tide.
Look carefully at this thread. People are taking what you are saying out of context and it's making you seem like a much bigger asshole than you are. Playing the asshole and pulling it off is VERY difficult. Most people who try just end up selling themselves short.