The chaos of trial and error inevitably produces a dictator, per Burke, and few if any examples to the contrary are available. Please list some. The stability to overthrow the dictator has yet to happen in Vietna, Cambodia, China, Russia, Cuba, et. al.
Burke was open to a Constitutional Monarchy, which almost occurred. Asimov, a favorite science fiction author, is sometimes known for his quote: “Violence is always the last resort of the incompetent.”.
The ancients had not our labor savings devices, hence the need for slavery, so that the victors did not have to do the hard work in the mines or anything else. Spartacus proved that even numbers against a trained army are meaningless.
Your argument that progress should not be slow, due to the condition of the masses, fails when one considers the condition of the masses under dictatorships of the proletariat or any other excuse. A lack of freedom of thought let alone speech is ever prevalent and since the regime is never stable, what is de rigeur one day is not the next. How does that promote stability?
People take a chance on revolution, hoping against hope that this time will be different. That is the basic definition of insanity. The greater corruption under the ensuing dictatorship ensues that the ruling class will never let go peaceably. The well off in the new instituted dictatorships have a conflict of interest, to say the least, quoting from your last line.