What you're saying isn't wrong. Everything about your opinion is correct. There's nothing bad or unpopular about saying that rape and rapists are bad. It's a pretty common conclusion. But if you find that your common opinion is making you unpopular, it's probably not your opinion that is the problem. It's how you are trying to make your point. It's possible to be right and also be annoying about it. Making one comment on a post and expressing your opinion, which I agree with, is a noble and correct thing to do. Stopping at every comment on the way and accusing each person you come across of being morally inferior is just being a dick.