Who says the rich are the enemy? Nobody. What has been said is that for someone like Mitt Romney, who is wealthy beyond most people's dreams, pays only 14% income tax, is not fair. And I'm not trying to pick on Governor Romney, but even Warren Buffett, who you mentioned in your post, says it would only be fair if he was taxed at a higher rate.
http://abcnews.go.com/blogs/business/2012/01/warren-buffett-and-his-secretary-talk-taxes/