When not around humanity, the imaginative banks of the human brain may say things about the "outside world" that may be wrong or distorted. When this perception of the real world is messed up, then most people won't want to leave the place they have been in for years because they may think it is "scary" or "vicious" for various reasons...
I hope that answers your questions well enough. I may be new to this website but I work on 12th grade stuff instead of 7th like I should.