Nobody here is advocating militarism, or condoning the "military/industrial complex" that Eisenhower spoke against.
Self-defense is something entirely different. Self-defense is not immoral.
There is an appropriate time for arming oneself.
Since you chose to quote from Luke, let me quote this to you --- from Luke:
And He said to them, "When I sent you without money bag, sack, and sandals, did you lack anything?"
So they said, "Nothing."
Then He said to them, "But now, he who has a money bag, let him take it, and likewise a sack;
and he who has no sword, let him sell his garment and buy one.....
Then they said, "Lord, look, here are two swords."
And He said to them, "It is enough."