Trump did say earlier in the campaign that his supporters wouldn't take a GOPe "screwing" lightly and implied there could be violence in that case. He didn't advocate it.
You're absolutely right, which is why Trump has taken to repeating, at many rallies and in media interviews: "The safest place in the world is at a Trump rally."
Trump knows branding, and he knew he had to get a counter-narrative going.
I like it.