The guy is a politician. Unfortunately, for obvious reasons, he cannot show the gesture of his own political camp. So he will have to make do with this symbolic loan. But it fits in quite well with his election campaign, especially as he strangely portrays his opponents as fascists.
I am pretty sure a raised fist predates government or even agriculture, but sure, let's work with very limited understandings of what things can mean. Donald Trump is a horrible monster, but I don't really see what good limiting what he does with his hands does for anyone.
I saw him spewing garbage on tv at the gym a few months ago; no audio, luckily, but they always have a tv showing fox news, and it was right in my line of sight. The ridiculous shit he was constantly doing with his hands had me cracking up. It was so over-the-top, to the point of parody. I couldn't stop laughing at the idea that anyone takes the chucklefuck seriously, just based on his moronic gesticulation schtick.
So yeah, let him keep doing insanely stupid shit with his hands.
I agree! It's super distracting, the things he does with his hands. The accordion bit someone did a few years ago was perfect. Because wtf else require hand gestures like that?