https://en.wikipedia.org/wiki/Fist%2C_Stick%2C_Knife%2C_Gun
People become okay with vigilante justice when they see the executive branch as compromised, just look at the insane plot/ending of the film Singham.
Many people see this happening in the US. We should expect to see more vigilante justice and organized crime if we see the executive branch as having a significant principal-agent problem.