MOST drugs do different things. The most extreme example, one of the "dirtiest" drugs, is benadryl aka diphenhydramine, an over the counter common drug. It basically does something to every receptor some one. Its main use is anti-histamine, but people recreationally use it (cholingergic activity). Also many other neuronal receptors.
The hypothesis here is "ivermectin works against parasites but is neutral to the human body LOL". If only. If only antibiotic or antiparastic were so simple. If only anything biological were so black and white. It's not as if one of the greatest classes of antibiotics now has a black box warning because it was found to cause people's tendons to snap suddenly. A simple pubmed search, "ivermectin" "inflammation" reveals the relevant mechanism, anti-inflammatory. In COVID it dampens the inflammation of the lungs, which is how COVID historically kills people - lungs fail and they go on a ventilator - fail from excess inflammation. So there's a viable mechanism.
The position of medicine the whole way was "we can't prove ivermectin works" which is a valid position. That position also means - "we can't show ivermectin DOESN'T work" either, which seems to be how people are running with it.
The armchair science here is, "LOL ivermectin doesn't work against viruses". Absolutely true, but not how it is meant to work. It's meant to kill the consequent inflammation. Why do we give people with upper respiratory infections steroids? Don't steroids weaken the immune system, the system meant to be clearing the infection? We give them to dampen upper respiratory inflammation, to make breathing possible, virus be damned. But it's harder to acquire steroids. Easier to acquire ivermectin. And so now a perfectly innocent drug is the scapegoat. Thankfully there are hundreds of other off-brand easily acquirable anti-inflammatories that will rise up like a hydra's head from the stigma of decapitated ivermectin
If people are spouting off strong opinions about ivermectin and can't converse competently about all that i just said, whether they are pro-ivermectin or anti-ivermectin, then they are part of the problem.