Go in a sandbox game, turn on god mode. I don't think you'll be helping old ladies across the street. Personally, when I have a massive amount of power in a game I'm pretty much a dick unless there's the incentive of more power. Black and White 2 for instance, I'm always Good aligned until the end of a map, then I just don't care and start chucking people around I rule the map bitches. You can see this in everyday life too, people with quite a lot of power being pretty close to what one would define as supervillainish.