It doesn't seem like a suicide to me.
I suspect a back-pack was left sitting on the bench (who would think anything of a back-pack sitting on a bench near 85,000 college kids) and the kid just sat on the bench beside it.
I suspect there were supposed to be a lot more kids around and more were meant to die.
I've seen some weird shi@ in my years on this planet, I hope you're wrong because if you aren't...
I believe in a couple of days things will be investigated more comprehensively and throughly. I'll keep my fingers crossed it's just a mentally disturbed kid, but keep my mind open to something more nefarious. In this day and age one can never be sure of anything anymore except that islamofacists want us terrified and dead.