Exaggerated: Anytime Eric is mildly annoyed, anyone and anything he looks at is disintegrated, so he has to always keep his eyes closed. This annoys him, and since he doesn't want to cause massive property damage he can't ever open them.
Downplayed: Since Eric's Eye Beams are voluntary, and he can lower their intensity, he's really no more dangerous than a well trained and ethical police officer.
Sally the Super Empowering fairy only gives the really nasty powers to people who can be trusted to use them responsibly.
Alternately, Personality Powers is not in effect, and if it is, Eric has since grown horrified at his potential for evil and resolved to be good.
Eric's calmness has slowly amassed in him over the years, with anger and pain being the most repressed parts of him, eventually forming into the ability to release his own pain onto others because he never did so before.
Zig Zagged: Eric is good and refuses to use his evil powers for evil. Except he's actually really trying to con the heroes. Only his power isn't actually evil. And he's pulling a double spy type deal to fool the villains into thinking he's secretly a villain when he isn't.
Averted: Eric is evil and he uses his evil powers for evil. Evil!
Enforced: The show is about Grey and Grey Morality, so the existence of Eric is necessary to confuse the protagonisits.
Lampshaded: "Whoever gives out superpowers must have a sense of humor, giving a literalDeath Glare to someone who will never use it."