The lady in the crowd warning people they were going to die is the most concerning to me of these strange occurrencies.

I assume you're familiar with the October Surprise method of ruling?

Every October some kinda 'big event' happens; You may wanna look into that a bit more as well :: because I'm not really sure what is going on. Was this guy a Manchurian Candidate?

October Surprise Videos on YouTube

Connections to Antifa, or Isis seem totally unfounded :: what's more likely is the white guy just snapped; like so many white men have done throughout the history of America; White men have carried out more instances of domestic terrorism than any other racial group.

We may want to examine white men in America closer, to understand what is causing them to be so violent and aggressive.