Since I own a couple of corvettes I belong to a corvette club that has international members, some of whom are in France. When the Charlie Hebdo incident came up and having unarmed police against armed terrorists, the subject of France's supposedly "tight" gun ownership laws came up. What surprised me was the answer from the french citizens. What gun control? Many of them owned a large number of weapons, including military grade automatics. One guy has a picture of him holding 2 ak-47 (the real assault rifles, not the ones ordinary people can buy) with the eiffel tower and his corvette in the background. This was not an american citizen in France, this was a real french citizen. The question came up about why own the gun if you can't use it, to which the answer came, the black market gun trade in europe is huge, and by that I mean gigantic. It's not just criminals who buy guns over there but ordinary people who keep guns in their homes, never report them, never sign up for licenses, never even take safety courses. Nothing. The obvious next question that came up was why? You know what the european answer was? They remember world war 2, that's why. All around them they have living history of what happens to unarmed people.
This is not just some crazy european right wingers, these are ordinary people in europe who no one would ever suspect. The bottom line is, just because you can't see a gun or think they are outlawed doesn't mean that there isn't one near you. It also means that the person who lives next door, who you think "gee what a nice person they are" is hiding some weapons, stashed away hoping they never need them again, but can still remember the death of their own aunts, uncles, grandfathers, and so on at the hands of invading germans.
The thing about America is the only people who participate in the black market are criminals. Everyone else can go to gun shows and gun dealers and buy what they want and then never have to worry about doing something illegal. I can go buy a gun, fill out the background check paperwork with the ATF, wait for the background check to complete (takes a few minutes), pay the other person, conclude the transaction and I am free to go. The person who sold the gun to me can breathe a sigh of relief knowing he didn't sell a gun to a bad person or someone with a criminal background. So because everything is done "out in the open" there is no need for black markets it makes it better to maintain your rights, rather than doing a transaction in a dark alley.