Instead, there are people arguing for increased surveillance. Which even if implemented "correctly" would not prevent crime.

Might be used to track women seeking abortions though.

How did banning drugs work out? Alcohol?

These things are not equal. Weed doesn't kill tens of bystanders in an area a second. We can actually look at places that have banned guns and it's done amazing. The reason to not do this are extremely thin at best.