The truth is an important thing when you want to get to the bottom of something and having the truth is the most important part of making decisions. This isn't just about programming but everything in life. The problem is that the truth is often at odds with tact.
Things to remember about the truth:
Sometimes, the truth will make people laugh.
Sometimes, the truth will hurt.
Sometimes, the truth will set you free.
But always, the truth will piss someone off.