Except most explanations leave out the part where guys usually make the sign near their crotch and then whenever another guy looks down there, they punch them in the arm for looking at their junk. Of course, the media won’t go there because...homosexuality.
Internet trolls created the idea that it was a white power symbol just to see how far their ridiculous idea would spread. Well, the leftist media will jump on anything they can to be able to accuse Conservatives of being racists.
President Trump uses many hand gestures when speaking. How many of them will soon be "found" to be secret white power signs? Interestingly, he never points, a symbol of aggression. When you see a politician poking the air as one would do if pointing at their audience, but with squeezed-together fingers, they have probably been trained not to point with a single finger, though that aggressive gesture is what is natural for them.