Most interdimensional entities that humans consider horrifying demons and eldrich horrors actually consider humans pretty dangerous unless they're actively trained fighters. Your average extraplaner being isn't used to dealing with a species that evolved to hunt in groups, and developed to survive in violent scenarios.
Most final girl situations happen because young entities deeply underestimate that humans have such a strong will to live, and are willing to fight back agasint a stronger foe. Most older entities keep at bay for this very reason, which is why you just see them stranding around being creepy.
That pale long limbed cryptid you spotted in a subway station moved so quickly because it doesn't want to end up near you. That shadow person whose hovering over you in the woods is trying to observe you, but it will teleport away if anyone comes near it for a good reason.
And that doppelganger that's standing by your door at night just wants to observe you too. He was smart to try to copy your roommate's face, but he doesn't realize how good humans are at recognizing eachother's faces, and that his copy will be disturbing to any human who sees it. And he got way to reckless with his movements and bad attempts to imitate human speech. Trying to trick the human who he wants to study into coming to his dimensions is an even bigger mistake, especially since he didn't realize how quickly the human would catch on. He's soon going to learn things he should have read up on before hand: humans will try to attack things they're afraid of if they can't run away, humans can use almost any hard object as a weapon by holding it and swinging, and that those decorations on your wall are called 'swords' and were not originally designed as decorations...
