As soon as he started talking about how excited people got when they heard the motorcade approach I got that sinking feeling like...oh no, Trump doesn't care about you though. :(
Like you already said, you're obviously speculating, but I think you might be onto something re: the dad. Dad trauma combined with suicidal ideation...it's plausible and way more reasonable a motive than a lot of the stuff out there.
God gives his strongest soldiers the hardest battles. 😢