We have an ID of the truck driver:
Thomas Richard Ross, 48, of New Waterford, Ohio
Per WTAE:
http://www.wtae.com/news/crash-at-pittsburgh-fbi-building-south-side/40888776
I am not too impressed with the quality of that gate.
Like I said, if you’ve seen that building in person and tried something anyway, you were either drunk or extremely stupid.
It was specifically designed to resist truck bombs after the OKC bombing. Impressively I might add. Even a layman could see that’s a fools errand.
My guess now is the driver had issues with pharmaceuticals.
He could still be a recent convert to Islam, and he simply hadn't adopted a Muslim name yet.