You are just completely wrong on this one.
The licensure process in many countries is so arduous and expensive few people are willing to go through it at all unless they are serious hunters/shooters or collectors.
Then they add on onerous storage requirements, insurance and random inspections of your premises to make it even more uncomfortable.
I have relatives and friends in many countries, and they tell me that is not true.
First of all, guns in the rest of the world are local, not by country government.
All you have to do is satisfy a local cop, and its all fine.
In countries like Israel and Switzerland, they even give everyone a gun because they have mandatory, universal military service. When you leave, they convert the rifle to semi auto, and you keep it.
So Switzerland and Israel actually have a higher rate of armed homes than we do.
We own more guns per person, but most of those are collection or storage armories.
To satisfy a local cop, you do have to register or license the person or the firearms, depending on local laws, but they are not difficult. You just have to join a sporting club related to firearms, or explain how you have valuables to protect.
There is no War on Drugs that has made 40 million people unable to possess firearms like the US has.
Storage is not a problem, as all that takes is a safe or cable locks.
Have not heard of a single country that requires insurance, as most countries consider insurance to be a scam, and I agree.
While in theory there can be unannounced inspections, it actually happens right away, and is arranged by a phone called appointment. They do not come in the middle of the night, like they do in the US if you get an FFL.
Look at Australia after they banned assault weapons. Less than 10% were turned in, and no one cares.
No one is being arrested for having assault rifles, and every boat has at least one.