Principal Tackles School Shooter

Question: Can a Christian justify violent personal action to save others or not?
YES!

Hebrews 11

By Faith They Overcame​

30 By faith the walls of Jericho fell down after they were encircled for seven days. 31 By faith the harlot Rahab did not perish with those who [j]did not believe, when she had received the spies with peace.

32 And what more shall I say? For the time would fail me to tell of Gideon and Barak and Samson and Jephthah, also of David and Samuel and the prophets: 33 who through faith subdued kingdoms, worked righteousness, obtained promises, stopped the mouths of lions, 34 quenched the violence of fire, escaped the edge of the sword, out of weakness were made strong, became valiant in battle, turned to flight the armies of the aliens. 35 Women received their dead raised to life again.

Shooter inspired by Columbine killers, wanted to kill as many as he could.
Glad the Principal took action and save many lives.