@einstein:
i do agree that each location that has banned guns experienced a spike in crimes. however, isn't this spike because the criminals are the ones who refused to give up their weapon and now are using it against people without them (so lower risk for crime). When you have a nation where guns never had been at a high number, or where it has become prohibited to wear firearms without a very-hard-to-get-gun license and has been so for a long time already, the crime rate is *on average, with UK and all being exceptions to the rule* lower (look at germany, netherlands, belgium, norway... etc).
i do not agree that places with high amounts of guns have a lower amount of crime. take your own example, mexico, where there's huge amounts of people who are in gangs who have access to weapons. look at all the places where there are civil wars, and all the places where there are international wars. A lot of guns there, also a lot of crime there. now look at most of europe: not a lot of guns, not a lot of crime.
So no, i do not agree to this point.
it is true that police cannot be everywhere at once, and having a big enough police force to do that would probably give too much power to the leaders of the police and also cost too much money. however, why would you need extreme measures of self-defense, instead of say basic martial arts training or pepperspray, or even the kick-in-the-balls technique, when there is less (extreme) crime.
@v. kemp
if the welfare isn't substantial, then of course there are high crime rates among them. oh and btw, if you had not yet noticed, your source is only about youth crime, not about crime in total.
even if that view i gave you is simplistic (i myself gave explanations for why it wouldn't be like that), you chose to say i was wrong when i gave an arguement against that view... so in fact you yourself created that simplistic view by not giving any other arguements for why that view is wrong, which is something i actually tried to do.