You guys keep using the colloquial term "terrorism" when Me, the guy who didn't eat the hat, the Police Chief, the media, and probably the Judge at his hearing are using the term in a legal sense.
Proving a crime of opportunity ("because he could") was a premeditated terrorist attack is going to be difficult as fuck.
Terrorism is the Tsarnaev brothers making and planting a bomb at the finish line of the Boston Marathon. Clearly planned and constructed from the ground up. No question that they set out to do exactly what they did from the beginning. Calculated.