History shows us that greedy people end up with their heads on sticks. Even when they have armies to protect them. It doesn’t take a lot to regress to that again.
I think recent history has shown that simply killing the Bourgeoisie tends to just eventually create another in the form of whoever had the power to do the other killings, and not always to better ends for the people. That form of communism has been shown to not really work. Democratic socialism though seems to work out pretty well for people.