He's a comedian. Actors and comedians rely on the charity of others. They typically hold very liberal views, in my opinion, because those views are what help them get ahead in an industry that operates on good feelings. There is a very thin line between appealing to people and pandering and one person's good feelings are another person's pandering. I don't begrudge him his opinion because I have my own. I still consider Carrey a massively talented person.