Good and bad is all from perspective, IMO.
When you see a 'bad guy', they tend not to think of themselves as 'bad guys', they try to make the world better for themselves. To them, this is obviously good, and to everyone else, it's bad. If you see someone call themselves, 'The bad guys', you are probably watching a Disney movie, or the person actually has a conscious, and knows what he's doing is wrong.