Sure, you "could" do all that and anyone "could" do whatever. That is conjecture. On the other hand people "are" using guns to easily kill.
And frequently at that.
There is, on average, a multiple shooting every 5.9 days. Which means that will likely be another one by New Year's Eve. Unfortunately, it will probably be a "run of the mill" shooting and won't make the news or it will involve a criminal and will be used as justification for increasing the availability of guns.