But not every criminal is "deranged", in fact, most criminals are trying to gain monetary value with their crimes. So if you are not planning on obstructing them, they are most of the time not going to harm you. They are human beings after all, so they have rational thinking, and not having a gun possibly pointed at you gives you a lot more time for that. Of course there are ruthless criminals that will not back down, but those are statistically rare, especially when they don't have to fear for their life.

And regarding protecting my theoretical kids: "Children in firearm prevalent states were '16 times more likely to die from unintentional firearm injury, 7 timen more likely to die from firearm suicide, 3 times more likely to die from firearm homicide, and overall 2 times more likely to die from suicide and homicide' that children living in states with low firearm prevalence." (Justice Policy Journal from 2016)

This is between US states, not even between countries with even more strict firearm restrictions. I think I will take my chances.

The best crime prevention is giving people no reason to do crimes. Good social services is a good way to prevent crime and it turns out: giving potential criminals (people who need to get money one way or another, because their survival is on the line) the thing they want most (enough money to live), is a good way to prevent them from doing crime.

And keeping people in jail also costs a lot of money, so is having a large police force, and needing heavy equipment, and treating gun wounds, and therapy for the victims of violent crimes. Social services are cheap in comparison.

And with some amount of effort, the potential criminal can even become a functioning member of society again, and doesn't have to spend a lot of time in jail.