No. it is not too late to ban guns in this country. Guns can be removed from the market through gun buy backs and voluntary gun recalls. These just get shredded or run over by bulldozers to make them useless as killing machines but worth something as scrap.
you are mistaken. Gun violence and gun deaths are a uniquely american problem as compared to other industrialized nations.
Other nations have very similar rates of petty theft, violent crime, rape, you name it. Only the USA excels in number of people killed by guns every year, and it is not close.
The USA falls outside of all normal distributions in gun deaths as compared to other nations on earth, it is considered an outlier for scientists. Normally - in distribution studies, you look at outliers and try to eliminate it.
You look for root causes for the outlier and try to eliminate the root cause, and see if the outlier disappears.
That's what normal people do, look at problems and try to solve them. In modern times it helps to have statistical models that help determine what is normal and what is not.
The rate of gun violence in the US is not normal. GET THAT THROUGH YOUR THICK HEAD. once you accept this as the truth it is - we can have the rest of the conversation.