The best way to kill specific terrorists, as individuals, is what has been recommended above. Covert operations. But....it is not the way to end terrorism!

The way to end terrorism is to end the tremendous inequalities and injustices from which terrorism has sprung. That would mean...ummm...regarding the lives and independence of ordinary people as being more important than the profits of huge financial cartels!

Hmmm. Don't hold your breath waiting for it to happen.

Castro could have waited for it to happen in Cuba. Instead, he led a revolution against it and won. For that, he has been hated ever since by those who lost their big profits in the process.