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The odds are pretty much nonexistent. You don’t accidentally load up an electric vehicle with a bunch of gasoline and fireworks, park it in front of a building with the incoming president’s name, rig the flammable material to ignite, and finally shoot yourself before it ignites. Supposedly his wife just broke up with him after Christmas, so perhaps he was feeling extra hopeless and wanted to do something extreme to get everyone’s attention.
Fascinating, the term athletics refers to sports in general in the US. Track and Field is indeed the categorization I am familiar with.