“Rav Bender trained his staff.”
That is a proof against your opinion.
Did all of Rav Bender’s talmidim suddenly purchase guns and carry them wherever they go?
How do you ignore the fact that a Jewish girl is a orphan from both of her parents on July 4th because of an assault style weapon ?
How do you ignore the fact that other Jews were permanently wounded from the shooting on July 4th?
Be Mispallel bishloma shel malchus, or else , Ish es Rayahu Chaim Belao.
Carrying a gun will not protect you against a AR15 shooter wearing protective gear or even a small group of attackers.