"Truth is beauty, beauty is truth". A bit of poetry everyone has heard. It is a lie. The truth is almost universally a horrid and distasteful thing that most people want nothing to do with. If you were to be truthful with people, and be completely honest, you would find yourself surrounded by hostile people.
Try some honesty at work. Tell your boss what you really think about their ideas. Tell them you are working just hard enough no to get fired. Let them know that if you get a slightly better offer you are taking without hesitation. Your boss knows that they are worthless, but they hate when other people bring that up. If you really let out your feeling about your work place you would be fired so very fast.
Ever had an honest conversation with your woman (or man)? Your with them because they are the best you can do, or at least you are too lazy to try to do better. You can think of few people you would rather be with, but at this point this person is already here, and it is less work to just put up with their shit. You could tell them about the dozens of thing they do that piss you off, but then there would be a fight and drama. Honesty leads to breakups. Communication, honest communication at least, is the greatest enemy of a long lasting relationship.
Honesty doesn't even work when you are alone. Do you know how god awful a moment of honest self reflection is? One where you admit that all the ways your life has gone wrong is your own damn fault, and you stop trying to pass the blame. You realize in such a moment that you hate yourself with the intensity of a thousand suns. This is why you have the person you are with, the discuss you have for them makes you forget about your self hatred. This is why you under achieve at work, because thinking you are better than your job give you an excuse to not reach for more. The worst part is, you find you have become all the things you never wanted to be.
That is what honesty is. It is hideous, and painful to behold. Lies and misdirection are what we have become comfortable with. If we were all honest at once, it would hurt, but after a while it would get better. However, the truth is just another lie.