[El Cid]

"...Makes you think......how is it that these suicide bombers have gotten so amaturish since 9/11 to the point where they can barely blow up themselves let alone anything or anyone else, where 9/11 was a perfectly detailed run that was flawless in it’s execution. Sounds like they had some help?"

I think partly:

1) We've somewhat culled the herd.
2) Prior to 9/11, with the fine Gorelick 'wall' in place, wannabe terrorists could practice all they want without fear of detection. Now they tend to be a little 'rushed' in their evil endeavors.
3) The Good Lord still provides HIS protection. I can't say we merit it, but HIS protective and restraining hand is still present...

[Eurotwit]

I think you are right.

They are increasingly forced to operate in isolated cells, forced to rely on bomb making information from internet sources etc.

Though as the saying goes. We have to be lucky every time, they have to be lucky once.