Also, the car analogy is invalid.
No license/registration is required to own a motor vehicle.

One can buy/sell cars at will sans government oversight.
It is only when vehicles are operated on public streets is when licensing/registration comes into play.

I could go on Craigslist right now and buy a car for cash, no waiting period, no background check, no ID needed.

Also, my copy of the Constitution does not have the amendment that outlines the "right to keep and drive cars".

Does have something about arms and infringement though.

There are a myriad of reasons why places like Chicago are as violent as they are. Longstanding social issues that could have entire threads dedicated to them.
Guns or the lack thereof is not the root cause.