Setting a price does not equal doing harm. Your rhetoric requires that the owner of the drug patent be the government.
Essentially, you are arguing that government should be able to force farmers to sell prime acreage for $10.00 per acre, because it benefits the buyers.
There is nothing quite like a Libertarian fanatic; reason flees, questions are not answered, reality is avoided etc.
Prices have been set for centuries. Have you ever heard of a "Contract of Adhesion?"