This is an excellent video by Larken Rose which points out that it is ultimately impossible for a just ruler to exist because anyone who claims authority over others is necessarily a tyrant.
"Want to fix the world? Throw the crown away. Ignore politics. Don't threaten, attack, or rob your neighbor; and don't vote for anyone who offers to threaten, attack, or rob your neighbor on your behalf. Don't, by yourself or by way of those in power, try to force others to be what you wish they were or force them to fund what you wish they would fund. Instead, try treating your neighbor as if he owns himself — because he does." — Larken Rose