Because they are aliens. That's why they do these things. That's why they view us as cattle. They need the blood to keep human form.
Teenage mutant ninja turtles = reptilians.
Pizza = Children
Because they are aliens. That's why they do these things. That's why they view us as cattle. They need the blood to keep human form.
Teenage mutant ninja turtles = reptilians.
Pizza = Children