This was always bound to be a lively topic.
Personally I think it's up to the individual to do their own research and then come to their own conclusions, and there is plenty of information out there supporting both sides of the argument.
I did this 2 years ago and ended up switching to a vegan diet and to be honest I couldn't feel better about the whole thing. And this is from a person that wouldn't consider a meal as a proper meal unless it had some kind of meat in it!
Obviously it's a change that I'd like to see more people switch to, but we have to be realistic here, it's a process that would (and should) be gradual. Everyone going vegan overnight would probably create more problems than it would solve! It's a process that should take generations if it's going to happen properly.
In the meantime am I going to hate on meat eaters? Of course not, very few people in my life are vegan, and I have to acknowledge that I am in the minority here. Whilst I've made the change I accept that's it's not the most important thing on many people's agenda's.