Just a little (possibly inccorect) culture note, but the Titans aren't [i]technically[/i] evil, they're just antagonistic to the current gods (Zeus, Hera, etc). The Giants were the ones who did really evil things. The only two possible exceptions are maybe Tartarus (whose body makes up the Underworld region of the same name) and Gaia (who created the Giants mentioned before to kill the gods and basically replace them). Otherwise, most Titans only sided against the gods in a war because they didn't trust the gods. (Again, I might be inccorect, but that's what I remember from history/other reading I've done)