I don’t think it’s a lack of creativity - our brains try to turn all sorts into faces and monsters and whatever else as it’s evolutionary beneficial to turn that shadow into a lion because there’s a small chance it could be, or that rock into a face because it could be a friend or foe, even down to looking at a mouse gripping something while eating and thinking “it’s like us”… When you consider that, of course aliens are going to look somewhat familiar as we’ve learnt to identify human traits better than nonhuman traits
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.