Even if the majority was doing it, banning it solves nothing. It only serves as a gateway. Specifically about acid, I needed it to clean my toilet so went around asking; I was escorted to a black-market shop in Noida which served other illegal things alongside like gas cylinders and hand-made guns.
Justice is the solution. Punish the criminals and people will stop doing it.
This had become a regular occurrence and the government only acted due to increasing number of such cases.