The active-duty Green Beret soldier who died after blowing up a Tesla Cybertruck in front of a Trump hotel in Las Vegas on New Year's Day left a note calling the attack a "wake-up call" for the country, investigators said Friday. "Americans only pay attention to spectacles and violence. What better way to get my point across than a stunt with fireworks and explosives?" Master Sgt. Matthew Livelsberger, the career Special Forces operative who detonated the rented Cybertruck and died from a self-