Here's what I think. Speaking the truth hurts.

I believe we are all not capable of being in constant pain not knowing when the pain stops. If the pain is too much to bear, we lie to ourselves, go in denial, get distracted or do whatever we can, very few have the courage and be wise enough to tacle the pain head-on when dealing with challenges, because it's natural to be afraid of what we might find out after facing the truth. 

Also, what defines "truth" can be debatable though. What you think is true can be wrong, say, 5 years later esp. when it comes to thoughts. 

Plus, humans are lying creatures by nature. I think no one can be innocent on that, it's just that we lie for a lot of reasons---to protect ourselves, to take advantage of others, not to make a big deal out of an insignificant thing, to make believe etc. Some people lie for vicious purposes, other are for more or less peaceful reasons. Each one is somewhere on the spectrum. Not speaking the truth and lying are not always the same thing. Although truth should be regarded highly, no one can't live being brutally honest all the time. 

(What annoys me is that some people think they are so perfectly moral that they walk around with a sense of entitlement...like they're better than others. If one is moral or not, no one is inherently better than the next person.)

ASIM, I couldn't understand your question of "why these days speaking truth is bitter then lie? How can we change this culture."  Did you mean to ask "Why nowadays is it considered better to lie than tell the truth?  How can we change this? 

I don't think there is any culture which values lying more than honesty.  Most people are very honest and they don't need to change how honest they really are.  I trust in humanity. :)

I had been taught that if I didn't have anything nice to say about somebody, then I shouldn't say anything at all about him. 

steveh,  you are positive thiinking man i like your thinking. yeah you are right 

to Elanvital

You wrote down the very interesting essay