Answer:
guns serve both good and bad purposes, criminals get them illegally, and the innocent citizens get them at gun stores and gunshows, and collect them, hunt with them, and defend themselves with them if nescessary (as the Constitution requires us to do), banning the PUBLIC SALE of handguns targets the innocent law abiding citizens, so, with the normal people without guns, the criminals (who will always have illegally imported guns) now have no opposition and no risk of someone refusing to become their victim, and crime will soar through the roof. Just look at Austrailia, Mexico, Japan and the UK, those nation have outlawed guns to the public, and gun crime has gone up 40%.
All gun bans and laws do, is cause crime to go up.