If you have a criminal record you're not getting a weapon. It's practically impossible in dozens of states to get a weapon if you're clean as it is, due to how difficult the liberals have made it.
Also, don't talk shit about the EU being gun free. 11/20 of the heaviest fire arm owning countries are in Europe. 9/20 are in the EU. Almost all EU countries have the ability to own fire arms for assorted reasons, including self defense. Even in Ireland, the country with the strictest fire arm laws in the Western world, you can still own a fire arm if you jump through enough hoops.
The Castle Doctrine was taken from the UK. It was originally a British law.
You're giving yourself 2 options there in the case of home invasion. Fight them with a baseball bat, or let them take your shit. You forgot about the invisible option where you let them take your shit and you get murdered.
I would rather the crims come heavy and me being prepared enough to handle them, than they come light and me having nothing at all. One's a level playing field, the other isn't.
And when it gets right down to it, bad people don't follow the law. In a country where there's no gun saturation to start with and a very small population, imposing firearm bans is extremely easy. See; Ireland.
In any other situation, you're far better off allowing them to continue in circulation and just keep a record of who owns what under the guarantee that your guns cannot be confiscated by law unless used as evidence in a crime, after which time it is returned to you. This means that should the restrictions ever tighten, they can't just disarm you because they have what you own on record.
If someone wants to get a gun, they'll get it. Doesn't have to be legal. In countries devoid of guns to start with, this is usually a sufficient blockade to deter many people from jumping through all the hoops to get it, but in most countries they're decently easy to obtain. If you were to ban guns in America today, you'd have 300 million illegal weapons in circulation. Good luck keeping them out of the black market.
This is all besides the point, anyways. There is nothing more important to me than my life and the life of those I care about. I shouldn't be forced to entrust it to an entity that is under no obligation to actually save it, and when/if it decides to do so, has a long response time. I would think the marker of a free society is the freedom to defend oneself from all aggressors. And the marker of a safe society is to have that freedom and never needing to exercise it.
Dunno where you got those stats about gun ownership in the EU but the US is miles ahead, Switzerland is the only country even close, still about 40% less.