When a nation is attacked within its own borders there is a need for security that is not bogus.
It is also not wise to pretend that a great, powerful nation can withdraw from the world without serious and deadly consequences.
Wise it is for a populace to secure itself individually and en masse, yes. Dangerous it is to surrender liberty, hmmmm? Dangerous it is to abandon self defense to a central authority. There will the dark side take root.