Having looked into this, it doesn't appear that the use of automatic weapons - or weapons that could be used for mass killings - have any bearing on defence of the individual. Owning 25 guns protects you from an intruder in your home no more than a single handgun would.
See, I agree it's a cultural thing so a blanket ban is NOT the answer.
The answer is baby steps. First you take proper control of weapons that can be used for mass public killings. So the automatics, the shotguns, etc.
By control, I don't mean "ban them".
In the UK, it's legal to own firearms. You must adhere to a set of laws though for keeping them. You must prove to the police when asked that you adhere to those laws.
So, a rough proposition.
If you wish to own an automatic rifle for "hunting", then it must either be kept with a local store where you can book it out when you need it (with proof of ID, etc) or you must keep it in a locked cabinet that only you and the local law enforcement have access to.
The first one is easy. The second a little more complex.
There needs to be a law that states exactly how a "dangerous" (yes, I love the ironic use of that
) weapon is stored. The police can arrange to check that you are complying with the law. It comes as part of your license. If that weapon is taken from the store and you haven't done enough to secure it (left keys hanging around, told people the combination code, etc.) and the weapon is used to kill somebody - then you are legally liable in some way for that death. Taking responsibility for the use of your weapon, but putting in place laws and regulations to assist.
Just an idea. People can have what they feel they need, but there's a system of protection in place. Everyone wins.
Handguns? If the 1% who have stopped a crime (only 50% of those (maybe higher) were criminals with weapons) by use of a gun feel safer with one, then fine. A single handgun can (and will in the future) kill, but the death tolls will be much lower.
Baby steps. Maybe the rules for keeping "dangerous" weapons expand on handguns in ten years, or twenty years..? Removing the cultural idea that guns are toys one step at a time.
As for the "owning guns would have stopped the holocaust argument.
Let's look at it shall we?
The governing party in Germany banned generally hated minorities (cultural scapegoats) from owning weapons whilst allowing the normal citizens to own guns. In a nutshell.
To apply this to the US to stop it from happening again. That means that the white Christian majority in the US should reduce THEIR number of guns whilst encouraging the minorities to increase their gun ownership. This will stop the American [essentially] white, Christian, right wing government from causing another holocaust in the US by allowing the oppressed to rise against them when it becomes clear that they are being oppressed.
It's a ridiculous argument to make and an argument that makes no sense at all when you actually give it ANY thought.
Though I did just essentially call Obama Hitler and lost the argument by default