Earlier quoted context omitted.
Because, for some weird reason, our culture has collectively decided that, even if most of us are capable of reading between the lines to understand what's really being said or is happening, it's often wrong and bad to be honest and transparent, and we should put the most positive spin possible on it. It's everywhere, especially in professional and political environments.
This is not a culture thing imo, being honest and transparent makes you vulnerable to exploits, which is often a bad thing for the ones being honest and transparent in a high competition area.
Edit: Shoot, look at the general level of distrust that the populous puts in politicians.