If you don't answer honestly, then people won't consider your answers to be reliable, and therefore everything you say will have less value.
Imagine a person that's completely transparent and honest. You can't find a more predictable and reliable person. That's something you can trust and rely on. How could you dislike such a person? Honesty is beautiful.
We live in a society where there's a race to the bottom when in comes to openness. We all are ashamed, lie, cheat. Full of insecurities. Constant worries. Who would like that?
This leads to a society where appareance is more important than substance. You go to we'll rated schools nkt to learn and get better, but to impress your future employer and get prestigious jobs. They hire you for the same reason (safer to justify hiring Ivy League students to your boss). The best way to get a job and climb up the ladder is nkt to work on your skills, it's to bullshit well. All because we're used to seeing the perfect side of people (they get to choose what they show you). That's just disgusting.