There are convincing 'logical' arguments for both sides. What matters is how much they stack up with reality, which isn't clear.
On the one hand, a gun is deadly, and so makes it easier to commit murder should you wish to do so.
On the other hand, an armed citizen's ability to defend themselves is a disincentive to crime (particularly professional crime) and so will reduce crime rates. Also, criminals are more likely to have guns anyway.
I don't see how anyone can look at those arguments and be so confident about the effect of gun law. I think all are valid, but the question is "how much?"
Furthermore, obiwan's line of argument misses the important point: which is that the attitude towards guns is likely the most important thing, not the number or type of them.
Obiwan claims he only wants to make a small change, but from what he argues, I don't see why he wouldn't keep on asking for that change even if it had been made. Had the Assault weapons ban been in force, would obiwan be arguing on the other side? How about if only small handguns were allowed? I still doubt it. Obiwan, whilst claiming (and I don't doubt his sincerity) to be against an outright ban of guns, is inadvertently arguing for it.
This is some data I compiled yesterday about civilian gun ownership and homicide rates in various European countries and America. The only remarkable things are how distinctly uncorrelated they are and how similar the crime rates are in intuitively 'similar' countries
(e.g. Lithuania, Latvia, Estonia or Norway and Finland).
Country: Civilian gun ownership (guns per 100 people), Overall homicide rate (per 100,000)
Large number of guns:
US: 88.8, 4.96
Switzerland: 45.7, 0.7
Finland: 45.7, 2.3 (yes, gun rate is the same as Switzerland!)
Moderate:
Norway: 31.3, 2.22
Latvia: 19, 4.8
Few Guns:
UK: 6.7, 1.2
Italy: 11.9, 1.35
Estonia: 9.2 , 5.2
Lithuania: 0.7, 5.6
Ukraine: 6.6, 5.4
Netherlands: 3.9, 1.0