Controlling the other guy's guns
All gun control movements, including the modern one, are basically "guns for me, but not for thee."
Even you, who believes "most Americans don't deserve the right to touch" a gun, are in no hurry to get rid of your own.
As far as organized anti-gun movements go, with segregationists, only whites would have guns. With statists, only the State. There's a centuries-long history of rulers making sure the peasants didn't have weapons that would be effective against the rulers.