Its important to establish this you have received this letter with the police. Ask them the laws regarding use of lethal force directly to the investigator. If your forced to shoot/kill defending your home it gives more background as to whats going on and why. I think it's more reasonable to expect somebody to be a little more hesitant with any potential home invaders after this letter.

I have however, lost alot of respect for the police after how they have handled ANTIFA.