Questions About NOLA NYE Terrorist Attack

Why did the NYE NOLA attacker do it? Reportedly he was a Texas native, former Army Reservist with a career in real estate -- why throw it all away to attack innocent people in the country he swore to protect just a few years ago? Why use an expensive rented electric F150? Did he have an ISIS flag with him? Why were there conflicting reports about whether the event was being investigated as an act of terrorism? Why weren't the metal bollards on Bourbon Street raised for the celebration? There are a lot of questions at this early stage of the case that a lot of people are going want answers to.