Not all heroes wear capes

Not all hero's wear capes

An Alaska man who brutally attacked three registered sex offenders — telling one he was an “avenging angel” — says his experience should serve as a deterrent to anyone considering vigilante justice.
source: https://nypost.com/2018/01/02/avenging-angel-headed-to-prison-for-attacks-on-pedophiles-warns-against-vigilante-justice/

Nailed it, literally