> states that already have the most restrictive gun control already, yet to nobody's surprise, hasn't done much to curb violent crime

The "most restrictive gun control" states in the US would still be generally by far the least restrictive gun control states in the rest of the developed world (you know, where gun-related deaths are a small fraction of here?).

Your answer smacks of "well, they tried and surprise surprise it doesn't work so why are we doing it?", i.e. "'No Way to Prevent This,' Says Only Nation Where This Regularly Happens".