We aim to be civilised. The fact that someone broke the law, whether officially proven or not does not strip them of any protection or rights (well - it does to some extent if they're jailed, but you know what I mean). He has the right to fair justice whether he was profiting from distributing copyrighted material, or not.
No, the best way to help the MafiAA and their ilk is to ignore Dotcom's rights just because he may be a bit sketchy. You're right that nobody will dispute he was profiting from copyright infringement. The emails alone make that case. However, that doesn't mean that the circumstances surrounding his arrest were not incredibly off-putting.
Very few people would make a better villain.
The best way to help the RIAA is to have a Kim Dotcom as your poster boy.