Ivermectin is prescribed (not proscribed) mostly for treating parasitic infection. Using it at therapeutic doses for Covid is dangerous.
But I'm not forcing my standards on anyone. If this family wants a silly treatment and there isn't anything better to do, then they should get what they want if they are willing to pay.
One of the reasons this doctor got screamed at is because he took responsibility for making all the decisions and the patient died anyway. Which is good doctoring, I respect that. But if he is surprised that a family is angry that he ignored their wishes without a good reason then he is not paying attention to how the world works. He could have easily just agreed with them and kept the peace, at no undue cost to anyone.