As I mentioned in my other comment, the gun related deaths halved 2 years after the gun laws [1]. Furthermore, in 1996, the gun deaths per capita were 2.84, the homicides were ~650 per capita. So of course you will barely see a difference with the homicide graph. The real difference is that there have been no mass shootings for 20 years.
So yes, it really is that simple and completely obvious.
So yes, it really is that simple and completely obvious.
[1] https://www.gunpolicy.org/firearms/compareyears/10/rate_of_a...