The recent Ivermectin poison statistics are more than a little at odds with your "markedly safe" categorization.
Here's a human study referring to their safety. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3043740/
More than 700 million people have taken ivermectin as an anti parasitic medicine. Something like 4B doses have been given. The WHO lists Ivermectin as an essential medicine.
That's why you should not be using it unless there is a clear benefit. For the 700 million people taking it as anti parasitic medicine it does have a clear benefit, but some of them still experience side effects, some of them even might have died.