there might have been a knapsack under that bench, and this guy was just unlucky enough to be sitting there?
the bottom line is - there had better be some evidence as to why he would kill himself, and that he had the ability to construct explosives to do so.
That makes zero sense.
Why wouuld some attacker leave a knapsack just to blow up a bench?
No, Hinrichs was the bomber here, and he intended to either:
a) kill himself in a way that really got him noticed
b) take others with him and do a suicide plot
3) kill others and not himself.....putting bombs under the buses or something.....but his timing was off
We don't really know which one of these is right yet.