How do you control someone who wants to be a criminal and, by definition, ignores the law in the first place?
Lets look at two countries with differing attitudes to gun ownership. The US, which people are familiar with, allow their citizens to possess firearms by granting them constitutional freedom to do so. The UK has one of the tightest attitudes towards gun control in the world.
The argument above suggests that gun control laws would be ineffective at reducing violent or gun-related crime, because the suggestion is that people who are willing to commit crimes would have no respect for gun control laws either.
So - lets look at whether this could be judged to be true, based on real-life empirical evidence.
From
http://en.wikipedia.org/wiki/Gun_politics_in_the_United_Kingdom#Comparison_with_the_United_States:
[In England] In 2005/06 there were 765 homicides, including the 52 victims of the 7 July 2005 London bombings. The population of England and Wales is 53,046,000 (out of the UK total - including Scotland and Northern Ireland of 59,835,000), which translates as 1.4 homicides per 100,000 residents.
By comparison, in 2000, police in the United States reported 5.5 murders for every 100,000 of population.
Okay, so there's a big difference in crime statistics between the US and the UK - the UK has a far lower count of homicides per head than the US. But that doesn't necessarily mean guns are the problem. However:
70% of murders in the United States involve firearms
Compared to 9.4% in the United Kingdom
Only 9.4%? That's staggering. That means less than 10% of murderers in the UK are able to get their hands on firearms.
So, how many homicides involving/not involving firearms does that translate to?
US - 3.85 gun-related homicides per 100,000 population
US - 1.65 non-gun-related per 100,000
UK - 0.13 gun related homicides per 100,000 population
UK - 1.27 non-gun-related per 100,000
This demonstrates that in the UK (with tighter gun control legislation) there are fewer murders involving guns. This is a correlation, not necessarily a causation, but the fact that the US has 30 times the number of gun-related homicides speaks for itself. Does this support the idea that gun control laws are ineffective? No, it does not, and in fact suggests the opposite.