There's always 2 sides to every story.Many examples from real life history can be taken.Many more were written by the winners and we never heard the other true side.
Calling one faction evil because it doesn't match your morals and likings is just plain stupid.If they were same then they'd be on the same team now wouldn't they?
Both factions have done questionably things now which did more is just a child's argument on greater and lesser evil.