Kill them with what? He was unarmed. This is real life not some action movie.
Blaming the father is wrong. Blame the thugs, and the Liberals that coddle them and who strip law abiding citizens of the God given right to protect themselves and their families.
Read my post, leave just long enough to secure something to use as a bludgeon. A rock, a pipe, a board, an umbrella, or if you find one first, even a cop.
Apply firmly to the back or side of the neck...
See my post #24, and the near instant response at 27...