Solo, you're right, violence has continued to decrease after the legalization. But it's not that legalization has improved safety, it's that legalization hasn't done anything to safety. I don't think you can bring that without a look as to what the laws actually did, and how effective they were. And I don't think they really mattered.
I know you asked Libertad, but I will say that I don't know what the definition is for an assault rifle. I know what they tend to look like, and I know what kind of rounds they fire, and I can differentiate between an assault rifle, a hunting rifle, and most major types of guns. I would like to be educated please, if you do know what the definition is.
Now, Libertad, I don't think you know what an assault rifle is. While I mostly agree with your sentiment (or at least the intent that I got from it), I think you are being overly sensationalistic in your condemnation of guns. While clip size is important (reloading takes a long time, in a firefight), the power of the gun is more important (low power=low chance of killing, due to low penetration and energy transfer), and accuracy is most important. Longarms are very accurate, typically, and as such can have well placed killing blows, where as pistols are very inaccurate typically, and thus harder to get killing blows off on targets, especially moving ones. And believe it or not, being shot in the arm is pretty survivable. Being shot anywhere but the head or heart is pretty survivable, actually, assuming you get attention quick enough. Also: most assault rifles are used semi-auto, not full auto.