It seems like even if you dismantle them via killing them or whatever, thousands of other terrorists appear out of the blue.
Up until this point, they don't seem like they are that fearful of us. To be honest, I don't have a clue what would stop them. Obviously, if you drop a nuke on their country, that will, but that is unrealistic and will not happen. So, thinking realistically, what can actually stop them or strike fear in them?

A tactical nuke on the Kaaba in Mecca during Ramadan? That's would stop them in their tracks dead because their beloved Qu'ran says that Allah would stop such a thing from happening.
You see, I am not squeamish at all, and it is far from unrealistic.
Imagine these shits do coordinated attacks on schools and kill thousands of American children. Politicians of all stripes would be hanging from lampposts and the person that is left in charge would have no choice but to nuke the Islamic world to save his or her own neck.