Because though you try, you're not feeling the actual weight of your body being pulled back during a running accelleration. Meaning if your brain cant sense the extra Gs, you'll never "feel" like you're running in the dream. But since there is nearly no acceleration for a slow walk, your brain can ewsily imagine walking. you can also try flying to get around. To achieve this you basically "jump" across a long span of space. Funny thing is not feeling body weight acceleration in a dream probably explains why you can't punch in a dream either.
Some type of hypnosis where they create a new personality and the other crap will never be remembered by them or something. IDK. Fuuuuck. They have moon children too, etc. I mean, they kill their firstborns and sacrifice family members and all that, but man.
>but at some point can't be having revenge on the good people of the world
They need their memory wiped or something and need to be told they come from somewhere different. IDK. I wonder about this part a lot. They have tons of them too.