As I point out it doesn’t end there. Even if somehow some way humans just naturally couldn’t see them we have other senses we have other sensing technology we have inference. Mud and dust that show no footprints, radio site surveys that show no interference, radar, infrared, lidar…A lot of this stuff you can see for yourself
Heck how do they pass thru buildings to get in and out with density? Would we not all notice random doors and windows opening and closing? How many secure sites on earth where you need to badge in to a every room.
Inference. Being invisible to us and complex is going to take a lot of effort to deceive us. You can’t see with an invisible eye. You can’t avoid sinking into the core of the earth unless you have some density, which makes you wonder why we never see their footprints. So if all our senses and technology has failed to find them they must be actively working towards that goal.
A failure state the human brain goes into. Like how certain optical illusions work on nearly everyone
Humans build narratives off senses. If there is already a cultural narrative and you have weird data will put it in there. You got a round peg and your culture gave you a round hole.
A physical chemical allows you to outwit infinitely powerful infinitely higher beings and they are powerless to stop it.
Bible: Angels visit earth and have consensual relations with human women. Angels also visit Abe and Sarah appearing to be humans. Angels visit Lot and appear to be human.
Also Bible: be not afraid of me despite being a lovecraftian nightmare!
Wait. If that is how it happened that means when half the population came back they all came back with 0% of their gut bacteria. Holy shit that would be horrible. The population doubles overnight and every single person and animal has the worse runs of their life. Meanwhile they can’t get the nutritional needs no matter how much food they eat. Spend the next few months while their family cries as they wither away surrounded by food.