Wait. Cmon dude. Trump says "fight" and people scream stochastic terrorism, this guy says you're free to kill Trump if you're not a coward and you're like "naw, that's just poetic license?" Don't be obtuse.
Trump is directing an audience of his supporters to fight, while this is a nobody tweeting at an entire country letting them know they are free to assassinate him. I actually do see a difference.
Specifically, it was directed at Iran and a compitulation to a previous political stance. He is also just some random dude and not a "billionaire" with an actual audience.
From what I understand, the first assassination it wasn't clear the shooter particularly hated Trump. Sounded more like a school shooter. If anyone has seen reporting otherwise I'd be interested to read it.