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Yeah, I wonder if there might not be a chilling calculation where they've concluded that acid removes the risk of the victim dying from head injury or bleeding to death from a stabbing.
If so then I reckon there is an urgent need to 'upgrade' the punishment for an attack with corrosives to match that of attempted murder. Even if a permanent scar could be argued to be a superficial wound.
It's cheap, easily available and incapacitates the victim in an instant.
Put the horrible consequences to one side and you can see why they use it.