[yorwba]

The WHO's guideline for "preventive chemotherapy to control soil-transmitted helminth infections in at-risk population groups" https://apps.who.int/iris/handle/10665/258983 isn't about "passing out drugs for funsies". They recommend mass drug administration for at-risk groups because hundreds of millions of people are suffering from parasitic worm infections that can easily be treated with a single dose of a cheap anthelmintic drug, but diagnosing every single case beforehand would be much more expensive.

Of course improving hygiene to prevent infection is important (that's also stressed in the guideline), but that will take much longer, while mass drug administration has immediate benefits.

Fear of drug resistance isn't a good reason to withhold treatment from people who really need it. The WHO's much more sensible strategy is to encourage research into alternative drugs in case drug resistance becomes a significant concern.