I think its also just an inevitable result of working somewhere. You're constantly surrounded by coworkers, you're repeatedly hearing all of the overly optimist

I think its also just an inevitable result of working somewhere. You're constantly surrounded by coworkers, you're repeatedly hearing all of the overly optimistic business justifications for why you're working on what you're doing, and maybe you read an article about the competition a few times a year. It's a classic echo chamber.