Or, at least, I don't.

[...]and had enough of a concience left that at the last minute he made sure he wasnt a homicide bomber.

Based on what I've read on this topic (which admittedly isn't exactly "volumes"), we don't know whether he was trying to get to the stadium and his devices went off early for whatever reason. I don't recall having read that he specifically chose some random place a hundred yards or so away from the stadium, just so he could have minimal impact.

Kinda like the old saying goes, but sorta in reverse. Never attribute to (conscience) what can be adequately explained by stupidity...Until you know otherwise. :-P