The fear is about being up to the justice and punishment of someone else’s law, someone else’s punishment, instead of my nation’s law, my God’s law.
We have all said offensive things. Now we don’t know when we are breaking them. And we don’t know if someone will come around the corner with a gun.
Self-defence is the most primitive and fundamental drive in human beings. It’s hard to fight it. But knowing that’s driving it helps.
Now that people are driven by this strongest force in the beings of a human, those who are looking for a war can use it to do what they want.
Knowing the mechanism, knowing who is about to bring the next mass deaths, helps us fight for peace.