Your idea of vigilantes dealing out justice instead of the justice system, makes me recall Hawkeye killing Bruce Banner in Civil War 11, and how in his trial, Hawkeye was found not guilty on account of the justice system thought it was acceptable for a private citizen to kill the Hulk because that was seen as a public service. As shocked as everyone was Hawkeye was set free, you could see, in a world where crazy powerful figures like the Hulk could be killed off, how that is acceptable. Man, when world-breaker Hulk took one step on Earth and cracked it open like an earthquake, you could be excused for thinking it was reasonable people were afraid of the Hulk being there.