I clarified the relevance. The point is the weapons that are being used to do these things are common, and basic. They aren't special weapons of war, which are more regulated, more rare.
You just missed the critical thinking.
Ar 15s are common. Fully automatic assault rifles are far less so.
Absolutely untrue.
The point, is that the most common device to do this with is ubiquitous and easy to access.
Properly defining it, and clarifying what is being used is important to coherently discussing the issue.