"But Livelsberger, who was an active member of the Army’s elite Special Forces, was known to be a 'Rambo-type patriot' and staunch Trump supporter..."

"... and law enforcement officers are investigating if he had purposefully picked a Cybertruck to limit civilian casualties, rather than for political reasons, the sources said. If he had used a normal vehicle, the explosion would have likely taken out the glass doors of the building and possibly the lobby — potentially killing innocent bystanders. The Cybertruck’s impenetrable steel design contained the explosion, while still giving off large flames...."

From "Cybertruck bomber Matthew Livelsberger’s wife broke up with him days before explosion outside Trump hotel in Las Vegas: sources" (NY Post).

UPDATE: Notes left by Livelsberger on his phone: "This was not a terrorist attack, it was a wake up call. Americans only pay attention to spectacles and violence. What better way to get my point across than a stunt with fireworks and explosives."

Quoted by the NY Post, here. There's also this, from an FBI Special Agent: “Although this incident is more public and more sensational than usual, it ultimately appears to be a tragic case of suicide involving a heavily decorated combat veteran who was struggling with PTSD and other issues."