Any group that acts with utter impunity and unchecked power becomes corrupt, eventually destroying the rest of society. That's history's lesson about despots and oligarchies going back to antiquity.
Ancient Rome is an excellent example of how a civilization rots from the head down when there is no accountability for those at the top. This is why the democratic philosophers of the 18th Century and the Framers tried so hard to create a system with checks and balances.
Now, that system of "laws, not men" is broken. Like Imperial Rome, and other tyrannies since, we know where this is going.