These laws generally come from the local community, not the token "evil" <insert-color-of-choice> man in a foreign country...
Not even sure what you mean by laws coming from local communities. To someone involved in the drug industry illegalization is a conundrum. On the one hand, you might get punished. On the other hand, you're incentivized to do it, because you'll make a lot of money filling the supply vacuum left by the formal economy. Add bad socioeconomic conditions into the mix and poverty becomes much scarier than criminal prosecution.
That's why keeping in mind the difference between legalization and decriminalization is important.
Or, what is the social need that the drug pretends to fill, and can that need be met in a better way before addictions get out of hand?