You’re jumping over points here a lot… Yes children who were raised to be a piece of shit will probably raise their children to be a piece of shit, but it doesn’t necessarily mean they’ll be the ruling family.

There’s examples of hereditary rule where the ruler is a great and largely fair leader, such as Pedro II and Elizabeth I, as well as the opposite, such as Kim Jong Un and Ferdinand VII, as well as great and tyrannical elected leaders, and great and tyrannical leaders who came to power militarily.