why anyone wants an "assault rifle"

Just to make a minor point on using logic. If P then Q is a basic tenet. The idea behind a logical structure is that P and Q can represent ANYTHING. Therefore, what Dte is doing is using logic correctly. However, all that has demonstrated is that we can't always simply use an apparent logical argument. If it doesn't hold true in all cases, then it is an invalid logical argument. You can't use it when it works, but ignore it when it doesn't!! I once taught this stuff.