Re: Ever have one of those moments when...
It seems as if you need to sit down and talk with your players about what kinda of game they really want to play. Do they want to be heroes fighting defending honor and standing up for good, vigilantes out for justice as they see fit, or villains out to do whatever they want.
Don't try and push the players into a mold that they don't want to conform to. This will only frustrate you and anger them. Find the direction that the players want to go in and then modify the campaign to fit. But of course, the character's actions should have consequences, so if they destroy downtown and kill innocent people, they will be hunted by the police and any superheroes in the area. Their secret identities might be uncovered, their bank assetts and not-so-secret base seized by police, etc.
Mad Tech