In the US, people don't go to the doctor when they have a problem, they go as a last resort because they have to ask themselves how much it would cost.
18% of Americans haven't ever seen a doctor and 40% of Americans haven't seen one for 5 years.
A number of studies in low income communities in the south show that over 60% of people in those communities have intestinal parasites. That's just the ones we know of.
One thing we know for sure is that ivermectin is about as magic as they say it is for parasites only. It's a fantastic drug for that.
Over 60% of low income citizens would likely feel much better after getting their parasites removed from ivermectin. So what they are seeing, seems true. They could be sick from something else but get rid of a long standing comorbidity of a pariste infection, you bet they are feeling good. They just think that relief from the varied symptoms from parasite is actually something else cured.
This ivermectin religion has real miracles, it's just not the ones they think they are. This belief is entirely created because Americans don't have healthcare. That's why this belief isn't found elsewhere.