We didn't defeat Germany by stopping German soldiers and searching them for weapons. In reality we didn't even defeat Germany by killing foot soldiers, there's always plenty of "cannon fodder". We defeated them by destroying their chains of supply and command, we made it impossible for the German soldiers (arguably the best soldiers in the world at the time) to fight effectively.
Oh, fine! Go ahead and learn the lessons of history! Share intelligent ideas! Think big all you wantbut we're still going to snoop into people's belongings on subways, because that accustoms the serfs to the idea that they have no privacy, no rights, no business doing anything without government permission.