So, what you are saying is that it is a bad idea to break into someones home because they might go all psycho on you and kill you...
Good advise.
(1) It is always a bad idea to break into someone's house.
(2) It is always a bad idea to murder a helpless woman in cold blood.
If she hadn't broken into the house, she wouldn't be dead.
If he hadn't murdered a helpless woman, he wouldn't be dying in prison.
Or...
Those who do not respect civility will eventually lose its protection.