You are walking with your mother. A guy snatches your mum’s handbag and runs away. You chase and catch him. Then you whack the shit out of him and he dies. Is it ok? Of course, not. Two wrongs cannot make a right.
You suspect your neighbour is abusing his dog. You break into his house when he is not around. You find that the dog looks like it has been abused. You free the dog and burn