While I agree, that our large inventory of "smart weapons", would be useful, all of those weapons can be susceptable to counter measures, and even be made to veer off course into civilian areas, where the bad guys aren't. Planes, drones, and helicopters can be shot down Such a rail gun has no such counter-measure. Meaning more accurate, and LESS INNOCENT LIVES LOST, in a time of war
What's the going price for an innocent life lost in war going for, on the left?