Personally, I think we have some garden variety terrorists without a message-just drones. Just heavy lifters. Some kind of tiny sleeper cell who hooked in some dead end kids.
I would be hard pressed to believe that they put together this bombing and strategy themselves. The timing was perfect for maximum carnage, but the execution was poor. And I am not minimizing the casualties-not at all. As you can tell, I am deeply wounded and outraged by this incredible act of cowardice.
For lack of a better characterization, they were losers. It probably wasnt too hard to convince them.