There is evidence to show it was terrorism.
There is evidence to show it was workplace violence.
One theory is that this guy was a terrorist, planning a big attack, but he got pissed at co-workers and went off the handle and did what he did.
THey did not seem to even attempt to use half the tools they had, if a terrorist had the equipment he had, a much bigger attack would have been easy to accomplish.
Witnesses are saying the guy got into an argument at the Christmas party and left angry, returning with his wife and assault rifles.
Something here does not add up.