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He might also have been trying to impress some young Hollywood starlet (Reagan got shot because his shooter got obsessed with Jodie Foster after watching Taxi Driver) or some other form of mental illness (besides being a gun nut and Republican, I mean)…
Also a chance that he knew an attempt on Trump would make him a martyr
Quick Edit: Not saying he thought things through or was sane. After all, he used live rounds when blanks would still make noise and ensure Trump was not in danger. Just that it could have been his intent