Why's it so hard to believe that a crazy and or racist guy just snapped and did what he did?

1. Everyone who knows him says this doesn't make sense.
2. The police had concluded their investigation and announced it was a "white supremacist hate crime" before the vehicle had even come to a complete stop.

The NS shooting was sus for sure but so far there's no evidence about this one.

If you find the NS shooting sus, then that should mean you find it at least plausible that the gov't would do it again to further other goals on their agenda.