Banning handguns is unconstitutional and would be ineffective. It didn't lower the crime rate in Chicago, NYC, or Washington DC.

Even a nationwide ban wouldn't work. There's over a hundred million handguns (IIRC) in the US and a cheap pistol is possible to make with some modern tools.

So you can't get rid of them, and you'd probably help criminals the most, by assuring them any law abiding citizen they attack will be nearly defenseless.

CR