Why does the MCU movies always focus on alie level threats?

It feels shallow to me that they always focus on alien level threats. We need earth threat sometime, like red skull or ravage, hydra or AIM, street level Green Goblin Venom or Carnage. Or Doom. There's powerful players here on earth, and evil masterminds. The cartoons did this really well, remember avengersncarroon with hulk as a complex character reting to be a good guy as a tragic monster antaganist then the second film had creative earth villains being the team together in the second film

Why does the MCU movies always focus on alie level threats?
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