After being told to "fight like hell" that day or else they "wouldn't have a country anymore"? And that since trials in a court of law hadn't worked, "let's have trial by combat"? And when informed that the crowd couldn't get close to the stage because of their weapons and the metal detectors, Trump snapped at his staff that they're "not here to hurt
me"?
Somehow, though all the plausible deniability winking and nodding, his fan base got the message; You can see it plainly throughout their communications and postings before and throughout the attack.