According to Hirsi Ali, along with drones, counter-terrorism and security measures, the West needs to invest in an ideological war against radical Islam. If terrorist violence is the jihadi hardware, its software is radical Islam. To cripple the hardware, you have first to block the software.
The Islamic world is investing in “dawa”, or Islamic propaganda. “Since the early 1970s, Middle Eastern charities have distributed $110 billion, $40 billion of which found its way to sub-Saharan Africa and contributed heavily to Islamist ideological indoctrination there”, Hirsi Ali writes.
Of course the easier way is to end Muslim immigration and shut down the mosques that spread hate coupled with deportation.
The math is easy, less Islam equals less terrorism.