In this gun-crazy society, it is not surprising at all. Many more to come at a gathering near you.
If guns would not be as easy to obtain, a deranged person would make much less damage, if any; don't believe it? Check out the statistics in England, Australia or other societies where owning a gun is not as easy.
But, hey, as the gun nuts say: "Guns don't kill people. People kill people!"
SL