I so agree.Killing Bin Laden did not prevent Abu Bakr. Killing Abu Bakr is not going to prevent the world's next master-terrorist. Worse, sooner or later, one of those guys is going to get his or her hands on a weapon of mass destruction. This game of killing them one after the other at the very best is only delaying the day of reckoning.
The problem of terrorism must be solved. Killing ain't the solution -- even if it is a holding action (and it can be debated whether killing is even an effective holding action).
Leaders of terrorists have been slaughtered with determination since at least the 1970s.
It is not even clear that it helped any.