Did some further reading, and it seems likely that the shortages were at least partially created by a boom in demand and crackdown on counterfeit ivermectin products. It's hard for me to see this as a partisan issue when everyone involved was just doing the best they could under fog-of-war conditions.
I disagree, but I would also have a similar reaction if it turned out that toilet-paper supply chain issues left over from the pandemic were going to affect our ability to manage screwworms, and that particular overreaction was non-partisan.