In certain parts of the world, assaults - usually domestic violence - are often carried out by throwing/pouring acid onto the victim’s face. See Acid Throwing.
This sort of assault would seem to require much more premeditation than, say, the use of fists or a nearby kitchen knife. So why are they so common in those parts of the world? While premeditated domestic violence does take place in other parts of the world, it rarely involves acid. Why the difference?