Whatever your thoughts on the meaning of the Second Amendment (the framer's intentions) -- the cat's been out of the proverbial bag for decades. There are more guns than people in the US. Our death-by-firearms statistics are completely out of whack with other industrialized nations. An altercation between two people that would result in a shouting match or fistfight in Japan, Australia, Germany (insert advanced democracy) can easily turn into a gun-crime in the US. But, it is what it is, as they say. You can't confiscate your way out of this.
The only stop-gap measures I can see common sense dictating are:
1) Making it harder for the wrong people to obtain guns (thorough background checks, mental health checks ...) and only allowing sales through licensed dealers.
2) Stiff, mandatory sentences for gun crimes.
As much the media likes to bleed-lead stories of mass shootings and assault weapons, by far most people in the US who are victims of gun violence are killed by simple handguns in suicide, bar fights, drunk tough guys, petty street crime and domestic violence.
And as much as it pains this "progressive" to say it, sometimes the only real solution to a bad guy with a gun is a good guy with a gun. But better that we had no guns to begin with.
Oh, and radical Islam is one of the greatest threats facing Western civilization today.