Sound reason? Hardly. In what we like to call “reality” around here, it is well known that a terrorist is not always connected in a tangible way to known groups or organizations. A terrorist can commit an act of terrorism on his own, and the people are just as dead as if he’d had a direct line to Osama himself.
Thus, it makes no difference if there was a “known” connection. They were going to blow people up, with or without connections. That’s terrorism.