I mean, it is fun to joke about. However, I doubt it. Even as late at the 19th century monarchs were blatantly having rivals imprisoned, and executed. Having large groups of people just rounded up and imprisoned, and/or killed, were stealing large amounts of wealth from the tax payers, and just so, so, much shit. They only really ever found themselves suffering legal consequences when other aristocracy decided they needed to go, or that someone else would be better. That, or if material conditions go so bad widespread revolt broke out, and mob justice was served.