Now, of course, very few Bad Guys think that they are Bad Guys. But you can't say that the RCC were good guys just because they wore the shiny armor.
Both sides felt they were perfectly justified in their actions. Stanley, because he thought it was the Titan's will that he gather the Arkentools, and Ansom, because he wanted to stop Stanely's rampant agressions/ didn't like a non-royal ruling a nation having taken over from a Royal under questionable circumstances.
IMO, Erfworld does not appear to have any good guys (other than casters with noncombatant tendencies). All else is open to debate.