Some people's sense of entitlement is disgusting. At the point where it is dangerous or extremely inefficient to deliver mail or anything else not critical to human life, no organization should be expected to do so.

For social security checks, there's this newfangled thing called direct deposit that came out decades ago. For prescriptions, it is always important to have a backup plan in case your online pharmacy cannot fill your order or it gets lost or stolen. Both of those things are YOUR responsibility, not the post office's.