Except for the bad ones who like having evil powers. Don't take "self-destructive" so literally - I mean something that would be bad for a good person's psyche and self-image, and would be a curse for them. I'm thinking of powers like Maya's disease - stuff that only an evil person would like having. Or it could be like Sylar's "seeing" power making him murderous and nutty. Not inherently bad for you, but with bad side effects. It would stand to reason that there are more powers out there like that, and would make for an interesting limitation to Peter's powers, if he gets the power-sponge ability back in full force someday.