Talking about terrorists in today's very modern society, maybe this will not end.
because the sophistication of today's technology makes it easier for them (terrorists) to access, recruit and buy weapons.
yes this is true to think that a 3d printing machine can now print a gun that can actually kill a man. with fast growth to our technology it might impossible to stop terrorism. There is always an opposition, different ideology, faith (yes since we can clearly see that some terror group are created from religion, but some say its just for destroying the name of specific religion, but who knows?), and nationalism.