I don't quite understand what in my post you're arguing against. I didn't mention homicide rate, I just stated that mass killings are just as likely to happen without guns. Japan, with its incredibly low homicide rate and extremely tight gun regulations, has had some seriously high profile mass stabbings. So has China.
I'm also gonna say that Canada has relatively few gun restrictions when compared to MANY first world countries. At best, our licensing system 'only' weeds out people with serious criminal backgrounds or mental illness. For "normal" folks, it could hardly be easier to get a gun... yet our homicide rates are extremely low. And the few homicides which we do have, are evenly divided between knife, firearm, and other means.
As far as homicide rates in the US... I've said it before and I'll say it again: that country is hugely varied, both culturally and economically. There are 10 states down there with a lower homicide rate than Canada, most of which probably have more guns than we do up here. There are also states known to have tight gun control (California, NY, etc.) which have much higher homicide rates.
I'm all for looking at statistics and attempting to draw conclusions, but until someone shows some actual proof that the availability of guns CAUSES higher homicide rates, I'm not convinced.