Fine. Round up all his family members and execute them in front of him.
Oh, yes, that’s uncivilized and barbaric. It’s about the only choice we have at this point since the terrorists are so embedded within their targeted populations.
That's a reasonable start. However, the only way out of this is for a nation to seal its borders, blow up its mosques, outlaw Islam, and systematically exterminate any violators of the ordinance.
Or else, instead of blowing up ALL the mosques, return them to use as the Christian churches, Hindu temples, and every other groups’ worship buildings they used to be before the koranimals invaded and massacred most of the original inhabitants and forced the survivors to become muslim over the past 1400 years.
In other words, the only survival for a nation is for a nation to put its survival as a nation above other interests. Makes sense to me.