We live in a very lonely world, and most people would rather shut their mouth and damn the consequences that have a healthy argument. It's cold comfort knowing you're right when no one wants to listen.
We are born into a cruelly honest world. Children, before life beats them down, are cruelly honest. Somewhere around that first full time job and the first pregnancy scare, all of the piss is taken out of us. We don't want to be judged, so we don't judge others.
It's a very sugar-coated world to live in.