I'm not sure anybody trolled him... I think Turning Point USA is just so flatline stupid that they don't know what the actual presidential seal looks like.
Turning Point USA is a propaganda organization composed of soulless slime who recognize that the conservative base are a bunch of hate-hearted idiots who'll believe anything they're told, as long as it's nasty, and they're profiting off of 'em big time. That's all they're about -- lying to people who want to be lied to and telling them it's okay to be bigots. They even keep black people on the payroll to spout white supremacist garbage so bigoted conservatives can look at them and go, "Hey, a black person's saying the same stuff I do, so I'm not a racist, I'm just right!" That's the whole purpose of Candace Owens, who's Turning Point USA's biggest "product." If you investigate the background of Candace at all you get a portrait of pure uncut sleaze.
Anyway, while that doctored seal is a good prank on Trump, I don't think any of 'em meant it to be... they just actually are that stupid and incompetent. They're basically a "young Republican" organization, and I've spent a lot of time around college... there's nothing more idiotic and scummy than a college Republican. Witness the Kappa Alpha scum at Ole Miss:
Think any of those geniuses have any sense at all? Aside from just being a completely shitty and racist thing to do, that's a "don't hire me, I'm an idiot" sign that's gonna be around their necks for life. And they deserve it.
It didn't surprise me much. Kappa Alphas are hardcore pieces of shit. Back when I was in college they were notorious for zooming around campus in trucks waving rebel flags and nooses and yelling the N-word at black students. I used to catch shit from 'em, too, because I was a metalhead and had long hair, which was a real no-go for conservatives back in the 80's. They'd drive by, yell stuff, and I'd yell stuff back... and then they'd slam on their brakes and pile out of their car... then pile right back into it when I didn't stop walking toward them. Five to one and they still didn't really want to fight. Occasionally you'd manage to get a few of 'em in a ruck, though. I kicked the fucking shit out of a few of 'em, still get aches in one hand when it rains from something a guy's face did to my fist (which, frankly, was dumb of me -- punching faces isn't the smartest thing to do). A friend of mine's band had a song called "Flying Possum Blues" that they wrote after a bunch of KA's drove by and threw a live possum at them because they had long hair and were hanging out with a black guy. The shit never ended with those bastards.
So, yeah, that they'd shoot up an Emmett Till sign doesn't surprise me, any more than their ideological cousins in Turning Point USA would foul up and pick a parody of the presidential seal. And, why not? Trump's a parody of a president.