User blog comment:Oghta/Controversial heroes/@comment-1705775-20190211161224

most controversial is by far guys like Punisher - the killer vigilante is seen as a hero by "edgey" people or people who have a differing morality from the mainstream but are seen as villains in all but name by many others.. by very nature the killer vigilante is the most controversial type of "hero" to exist.

some argue (either to be edgey or out of real belief) that the mass-murder of criminals help society, many others point out the obvious negatives of such an idea - as well as the whole thing being far too close to reality for many people's taste.

Punisher is just the most known example, there's others like him (and many worse than him) but as far as controversial heroism goes that's the most controversial you'll get.