I am an old man now, but I can remember going out to Gran'pa's farm for the 4th of July.
Gramps would wake me up at sunrise, and we would take the pickup out to one of the fields.
He would then pull a half stick of dynamite out of his bib overalls, and secure it under a tree stump that needed moving.
He would then light the fuse, we would retreat to the pickup, parked some distance away, and watch the stump fly, insuring that the whole township knew that it was "Independence Day".
That was some 50 years (or more) ago, but it was still america.
Gramps bought that dynamite at the local hardware store, without any permits, licenses, background checks, or government supervision.
Ordnance IS arms, just as is a rifle, pistol, or any knife, club, or esoteric oriental throwing star, etc..
Explosive materials and devices are, and let me stress this, simply tools, mostly used for good, sometimes abused.
The fact that a small percentage of people may use something for evil purposes is NOT a license to ban it for use by ALL..
I know individuals I would trust with an Atomic Bomb.
I also know Nations and Leaders of Nations I would not trust with a hand grenade.