As illustrated by Luigi and the response to his actions, "ordinary people" in the US know exactly who to rebel against.

It should be noted that his assassination attempt followed a year where no less than 3 people set themselves on fire in protest of another arm of America's industrial grinder. Which is to say that the most recent act doesn't represent a sudden escalation, but is instead emblematic of a progression from despair to anger. Several billionaires also predicted this progression, warning their peers to ease up on their behavior. They're not listening, and some "ordinary people" seem ready to make them.