A student or child tries to visit a blocked site. Safari displays a stark, grey screen with a message: "Restrictions Enabled" or "Cannot Open Page." The user’s immediate thought is, "Safari is broken."
Ultimately, Safari is rarely the problem. It is just the messenger. To unblock Safari, you don't fix the browser. You fix the human, the network, or the clock. And in that order.
There are two very different answers, each leading to a completely different solution.