If you can't even fill this questions in yourself that makes you as illogical as the Thai decision makers are. As well as clueless...
Anyone with the tiniest brains would understand that at the worst, for tourists and users causing most noise, they now buy illegally with police covering the seller. That improves nothing, it only makes it worse again, less safe, less controlled.
Then for flip flopping every rules and laws in the country, to deceive large foreign investors and i could write a book more. Just use the brains.