When any one breaks into your home your life is in danger . You have no reason to even think they may not harm you or yours . And when it is done while pretending to be police it’s even more dangerous because they are trying to make you compliant and fearful of taking any action . This tactic has been used many times it was also used to rob and kill every one in the house . That is also why the use and over use of no knock warrants are so dangerous to the occupants as well as the police . Smashing into a home in the middle of the night or wee hours of the morning with 1/2 a dozen or more people screaming only adds to the chaos and confusion . But in this case it seems to be clear they had every reason to believe their lives were in danger and every right to use deadly force .