The likelihood of the crime rates increasing because the victims didn't have guns is negligible imo.
I thinks it's mostly about whether you have guns right now or whether you don't.
If you don't then introducing them would naturally be problematic if not downright terrifying. Making them freely and legally available to every teenaged delinquent and angry ex-wife in London would, of course, lead to carnage.
If you have them, you surely see no compelling reason to give them up.
I would point out that it's not M-Way speeding where the vast majority of deaths occur
so limiting speed to 65mph would serve no purpose whatsoever
Trucks being restricted to the inside lane only and banning anyone for life that causes a M-Way accident would help more
Unless eveyone drives at 20mph maximum then deaths will occur
Essentially, for the rest of us, the US is just a television show,
subject to the necessarily restricted perspective of that medium.
To me, the only "fact" that matters is there are more than 300 million people over there and they seem to do alright.