Another theory is that he might have thought it would accelerate the right leaning movement by killing or wounding Trump. It is also possible he liked the movement but not Trump.

Theories 1 and 2 don’t make any sense. Trump has too much of an ego for 1 and 2 would be weird. If you aren’t going after Trump, anyone else would be easier to shoot when not next to Trump.

I don’t know for sure but I assume of it is because light roofs require more maintenance to look as nice. Nothing shows up on a dark brown or black roof. A white or light grey would show dirt and debris. I don’t want to waste my time washing my roof because my HOA doesn’t like the way it looks.