What
"anyone could do this!" is a horrible reason for anything.
as i said, anyone can literally do anything from a bombing attack to a shooting spree. the worst possible solution to this issue is to limit the freedom of everyone.
anyone can shoot someone else with a gun, but that doesn't mean we should ban everyone on this continent from using guns. so why is "they can be bombers!" a valid reason for banning regular-ass visa holding citizens from traveling to and from the united states?