How common are worms in western societies?
https://parasitesandvectors.biomedcentral.com/articles/10.11...
Enterobius is quite common across the world. It's also considered to be minimally pathogenic, so it probably is only treated in symptomatic cases.
But from what I've seen in research and been told by doctors, they see no reason to worm adults as a precaution. I'm not sure what the supposed downside is of doing it once a year or so - nasty side effects?