I think the defect in this reasoning is that criminals will, in general, not know ahead of time if their prey is armed. The number of exceptions is probably insignificant. If tsing tao believes he is significantly safer in his home than someone without a firearm, he is deluding himself. Only if all , or a very high percentage, of home owners were armed, would having a loaded gun at home ready to fire have a chance of making a person more secure in their home. And even then they might not be statistically safer. As a matter of statistics, the number of accidental shootings in homes with guns is higher than in homes without. The number of accidental shootings in homes without a firearm is statistically zero.
If criminals gave the probability of a proprietor or home owner being armed much consideration, one would expect that very few liquor stores would be robbed; yet liquor store robberies are common. Why? Because they are open late at night when few customers are around. This would seem to be a feature equally as important as the probability of the proprietor being armed, and probably far more important.
It seems the U.S. could learn much from studying countries in which firearm ownership is at a high rate; yet gun violence is a small fraction of what it is in the U.S. If firearm ownership were a deterrent of gun crime, the U.S. should have a very low incidence of gun violence; yet the incidence in the U.S. is high. There is definitely something very wrong with tsing tao's reasoning. It is not gun ownership that deters crime, but something else entirely. Good candidates for this something else is type of gun, uniformity and type of gun laws, registration and transfer of ownership requirements. The important factor is clearly not as simple as the rate of private gun ownership. Even so, there can be no question that if guns were distributed evenly in the population -- they are not -- reducing the number of guns uniformly in the population would reduce the probability of a gun being used to commit a crime.
If one were to correlate gun ownership with gun crime in different countries, I would guess there would not be a consistent correlation. Any correlation there is would likely be positive rather than negative. It doesn't seem that high rates of private gun ownership correlates at all well with lower incidence of gun crimes. There are countries with high incidence of gun ownership, and incidence of gun crime is low; there are countries with high incidence of gun ownership, and incidence of gun crimes is high. Obviously, there are factors more important than gun ownership, per se, that affect the level of gun crime incidence. Thinking you are any safer in your home because you bought a semiautomatic pistol is foolish. You may in fact be less safe.
For many years I lived in Cary, North Carolina. Cary is always listed as one of the safest cities/towns in the U.S. Many years it ranked number 1 on the list. There are two reasons for this:
1) The majority of people who live in Cary North Carolina are upper middle income people who work in Research Triangle Park.
2) Cary has one of the highest household gun ownership rates in the nation. The population includes many military veterans who are comfortable with firearms.
There is an obvious correlation with Cary being one of the safest cities/towns in the U.S. and the high household gun ownership rate. There are other cities that have similar income / size demographics and much higher crime rates because of restrictive gun ownership laws. and low household gun ownership rates -- which merely serves to embolden criminals since they know their victims are defenseless.
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