Actually they wouldn't save 1. Methodology would change to another option. Same thing with suicides.
Hell, some teenager in the UK was killed by a gang with swords a few weeks ago.
American doesn't have gun problem. It doesn't have a gang problem, or a drug problem, an obesity problem, drunk driving problem, or an unwed teenage mothers problem. America has a responsibility problem. When we as a society can figure out how to collectively be a responsible people, we will see these problem go away.
Please note, not everybody has a responsibility problem. In fact IMHO people here are part of the solution not the problem.