I and many others are in the same camp. The reality is people like solving the problem themselves. In your case I would said (and in the passion of the moment

I and many others are in the same camp. The reality is people like solving the problem themselves. In your case I would said (and in the passion of the moment I cannot think this clearly): Dad that is awful that the pharmacy you are REQUIRED to use sucks. And that it is against the law for you to change it.... Yeah not very subtle, but you get the idea, lead the horse to water by being sympathetic and emphasis the non solution but leaving them at the water they need to drink.