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Matthew Livelsberger, 37, also wrote in notes left on his phone that he needed to "cleanse" his mind "of the brothers I've lost and relieve myself of the burden of the lives I took".
He had served in the Army since 2006 and was deployed twice to Afghanistan.
He wrote in one letter: "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."
The letters covered a range of topics including political grievances, societal problems and both domestic and international issues, including the war in Ukraine. He said in one letter that the US was "terminally ill and headed toward collapse".
Investigators are still trying to determine whether Livelsberger sought to make a political point with the Tesla and the hotel bearing president-elect Donald Trump's name.
news.sky.com...