I wonder if the liberal cult considered the term "assault pistol" and decided it was too silly to use.
Based on usage, I guess putting the word "assault" in front of a firearm type means it is designed for use as an offensive weapon, as in an assault on a position, meaning that you are moving toward the enemy.
Since the attacker and the defender both want maximum firepower, what really are the characteristics of an "assault weapon?" Do shotguns and sniper rifles have a roll in an assault? Are true assault rifles useful to a defender? Since "assault" implies movement while "defense" implies being more or less stationary, since the one is bringing the fight to the other, maybe portability is the primary characteristic of an assault weapon