Sure, they have used bombs for mass killing too. Even used plane as weapon of mass murders as well.
You have NO IDEA how many guns are in this planet! Once ban, millions, or maybe even billions of rifles will be tucked and hide and NO one is going to give up thousands of dollars worth of rifles. There is NO way we can wipe them out. Government have made several UNSUCCESSFUL attempts to wipe out several things, including alcohol, cannabis, cocaine, guns, and so forth and NONE have yield productive result.
If one wants to obtain guns, there are many ways to do so and they are very easily obtain, by smuggling, though straw buyers, stealing, and IF one has machine shop, they got everything needed to make guns from scratch and no one will know.
If you wish to be in gun free zone, move to Japan, or Brazil in South America, good luck surviving in Brazil!
Leave 2nd Amendment ****ing alone will ya?
All of you haven't answered my question. Why did he use the assault rifle, not knife, sword or shotgun?