You need to look at
total homicides, not "gun homicides." How does that prove a law "worked" if the same number of people died, but by different weapons? How are people who are shot "more" dead? If guns are actually more effective murder weapons, then fewer "gun deaths" should also translate to fewer murders, period. Does that happen?
"There were 773 deaths initially recorded as homicide in England and Wales based on cases recorded by the police in 2007/08, an increase of two per cent (15 homicides) since 2006/07."
"There were 766 deaths initially recorded as homicides in England and Wales based on cases recorded by the police in 2005/06. This is a decrease of nine per cent since 2004/05."
04/05 - 839 homicides.
05/06 - 766
06/07 - 758
08/09 - 773
A much smaller change from 04/05 to 05/06 in terms of total homicides, and the change has not yet been shown to be permanent, either.
Now, Arrkhal, I have another question. Do you feel there is any need for civilians to own, say, assault rifles? It's not like an M16 is gonna be much use for self defence...
How about a different tack on that. Do you
need food other than bread, water, and vitamin supplements? Do you
need a house larger than a single bedroom and kitchenette? Do you
need more than about 10,000 pounds a year to just barely survive? Do you
need to have sex other than for the sole purpose of procreation? Do you
need a car that goes faster than about, say, 40 km/hour? Do you
need a car at all? Walking and running have worked for millenia, and there's always public transportation.
Of what
real utility is a car that's even
capable of exceeding the speed limit?
"Need" is
not a criteria to deprive someone of something, even if it's potentially dangerous.
Other than that, full auto fire is hugely overrated. At long range, it's nearly worthless. At close range, it requires very extensive training to score multiple hits on a single target. "Spraying the room" is a
completely useless tactic, which only works in the movies because actors use blank ammo, and only works in video games because hitboxes for bullets are about 5-10 cm wide, rather than <1cm.
If you know anyone who's fought in a war, ask them, if you like.
The consensus among most American veterans is that full auto fire is okay for keeping heads down (because of the noise), but semi-auto is what's actually accurate enough to inflict casualties. "If the first shot misses, the rest of the burst will, too. If the first shot hits, the rest of the burst will miss." An actual squad automatic weapon or light machine gun is different, of course.
Even at close range, real world recoil means that after the first 3 or 4 shots, the rest of the magazine will fly over everyone's head, without extensive training. And if a criminal has that kind of training, it doesn't really matter
what they use, does it?
And finally, I'm relatively okay with the law on machine guns in the USA as it is now, I just wish they would re-open the registry (a real Colt M-16A1 costs about $16,000 USD for a good one; later models aren't legally available). You need your county sheriff to sign a form stating that it's legal to own a machine gun in your jurisdiction, among other paperwork including submission of fingerprints and a photo. Good luck getting your sheriff to sign a "I want to buy a machine gun" paper if you have any criminal record at all, or even look or smell funny.