Yes...they do REALLY believe this. It makes them special and extraordinary. It makes them selfish and self-absorbed. Afterall, how can you really have a meaningful relationship with anyone when you know they don't measure up as well as you do, and they are probably gonna get taken out? That's why everything is so superficial. That's why gossiping is so bad and throwing people under the bus is commonplace.
I heard it said once, "Being a witness is a selfish thing, you have to ensure your salvation before anyone else's. That's all that matters. It's like when the flight attendant is going over the safety procedures before a flight, "make sure you put your oxygen mask on BEFORE assisting anyone else."
As for the children? Don't get me started.