This is why we need to completely eradicate our enemy. But our current tactics are to disrupt and then leave them be until they grow in strength again and become a problem once more.
How do you propose we “completely eradicate our enemy”?
By not leaving Iraq prematurely, also by not leaving Afghanistan. Continuing to hunt terrorists in those regions, and work with other nations in capture/kill missions in host nation. Make it known to terrorists worldwide that if you choose that profession, it will end with your capture or your death.