I have a question. If this was a simple suicide why didn't Hinrichs just shoot himself? According to newspaper accounts and statements by people who knew him Hinrichs was familiar with guns. Going to the trouble of building a bomb seems like a gross violation of the KISS principle. Not only that what guarantees did Hinrichs have that the bomb would go off, that it would go off when it was suppose to, and that there would not be anyone nearby to be hurt.
I feel for this man's family but some of their statements are leading to more questions instead of answers.
Also the additional bomb making material found is very suspect.
Suicides are frequently very egotistical people who feel the world has slighted them, and they want to go out with a dramatic gesture that will attract attention. They particularly want to shock the people they feel are responsible for their unhappiness - a lumber worker who felt he was not appreciated at work, for example, tied himself onto a log before it went through the saw, in front of the eyes of his horrified co-workers.
It could be that this guy felt the University had "done him wrong" and was planning on doing something spectacular and public, preferably at half-time, that would get the attention of everybody at there. From the reports of other people here, it sounds like his blowing up on the bench in a relatively out of the way place may have been an accident, and not what he had intended to do.