That's a good point about the freedom, two different ways to look at it.
But today, like Wearer of Hats said, it's not impossible to purchase a gun, just not easy. It would involve a lot of paperwork, a lot of verification by many groups, constant checkups and possibly even training would have to take place. Plus all the secure lockups you would need to be installed in your home.
They didn't totally ban guns, just made ownership extremely stricter. And since then, crime rates have dropped dramatically, not just gun crimes.