¨Anwar Nasser Abdulla al-Awlaki ... was an American imam who was killed in 2011 in Yemen by a US government drone strike ordered by President Barack Obama. Al-Awlaki became the first US citizen to be targeted and killed by a drone strike from the U.S. government.¨
He was a terrorist but he still had rights. And then there was the murder of his non-combatant son who was "collateral damage" from a drone strike on a restaurant:
¨Abdulrahman Anwar al-Awlaki ... was a 16-year-old United States citizen who was killed while eating dinner at an outdoor restaurant in Yemen by a drone airstrike ordered by U.S. President Barack Obama on October 14, 2011.
...
¨Another U.S. administration official speaking on condition of anonymity described Abdulrahman al-Awlaki as a bystander who was "in the wrong place at the wrong time," stating that "the U.S. government did not know that Mr. Awlaki's son was there" before the airstrike was ordered.[8] When pressed by a reporter to defend the targeted killing policy that resulted in Abdulrahman al-Awlaki's death, former White House press secretary Robert Gibbs deflected blame to the victim's father: "I would suggest that you should have a far more responsible father if they are truly concerned about the well-being of their children. I don't think becoming an al-Qaeda jihadist terrorist is the best way to go about doing your business."¨
Joe Biden could do this and get away with it. Arguably Obama did, as stated above---there might be better examples. If Charles tried, no one would probably listen, and even if he did, once word got out it would probably actually be the end of the monarchy. Charles is not a dictator, autocrat or anything else. And in fact the US president, though elected, is much further along the spectrum towards autocrat than the British monarch. Many actual autocrats are in fact elected, so this distinction isn't really important anyway.