Well, I can agree that terrorists are not to be confused with "ordinary" nutters who have a gun and use it on other people. Terrorist have to have a philosophy, a belief system to which they subscribe; in other words, a common agenda with others of similar mind, that could be one of religion, of politics. These people are not to be confused with common criminals who simply want to rob you, or with folks who are high on drugs. Terrorists think they are in a war situation. That war has even been declared out loud.
I can't see how anyone not involved in terrorism would do this kind of thing and be of sound mind. That they do, that they find so many weapons and so much ammunition available is quite unbelievable; surely, the least one should have to do before buying more ammo is account for the use of ammunition: why are you shooting anywhere outwith a target range, anyway, where use can be verified before you buy more shots?
Not much, but it might prevent some of the stocking of arsenals.
Of course, it's not gonna happen.
Rob