I could see someone saying “well I don’t really agree with Trump’s extremism but at least Trump supporters haven’t tried to kill Biden so maybe the left is the problem”. It’s not as easy to wave his fearmongering ravings about the left off as conspiracy theories–someone on the left (I assume) actually tried to kill him. He’s a martyr now.
I really truly want to hope that you’re right but damn if this doesn’t make me super pessimistic about Biden’s already shaky support.