The past's a bit different, changing demographics, increasing populations, different spread of wealth and other factors change the rules of the game quite a bit, so the old approach may no longer be a valid or even relevant solution.
Yet plenty of places in the world have undergone similar changes and their laws haven't changed either... but their situation is better.
And the most obvious difference is not allowing guns without a proper given reason.
What am i to make of that in the face of research mainly stifled or influenced by the NRA with its three million members and corporate ties?
I mean even the mention of Australia that i see so frequently recently is pretty bizarrely simplistic, most obviously failing to account for the fact that guns don't disappear overnight, especially among criminals, but will rather require years and possibly decades to be filtered out of the system properly, with similar convenient oversights for things like "but these things happen only in gun control zones".
So yeah, maybe it's not laws you need, but you certainly need to work on effective law enforcement.
(and just putting many people in jail or killing them doesn't really seem to work out in favor of the U.S. either)