The fact is that you can’t ban gun in the US. It’s just impossible. There’s too many of them that any change in law in that regard would take generations to see effect
I find this a weak argument. Cigarettes and ICE cars were equally if not more so pervasive, and through legislation we have seen change occur to the use rates of both of those, albeit much slower in the case of the former.
You are right in that effective gun regulation in the US will be a monumental task, but not impossible. It’s just the best time to have started was yesterday.