If it's proven that Ivermectin causes more harm than good, shouldn't the authorities do test purchases, follow the money, and then charge whoever sells this with negligent bodily harm ot similar?

More controversial, maybe it should be just illegal to run misinformation campaigns that harm people in a crisis like this. I know people will say, what about free speech, but we already regulate health claims. And in a war it is/was illegal to spread misinformation that helps the enemy, so why not in a crisis like this?