This reminds me a lot of what Leornard Piekoff wrote on the subject of lying.
Pretty much the same argument, but he did list some exceptions to this rule.
For example, if may be necessary to lie in order to save your life from a murderous regime.
However, there are also less life-or-death situations when lying may also be in order.
For example, in a job interview you may say "I am the best man for the job", when you really think "I hope to be the best man for the job".
There may be times when people want you to lie to them.
For example, if a woman asks you how she looks, she doesn't want to hear that she looks terrible, even if that is your honest opinion.
Maybe for privacy reasons.
For example, someone may ask "How are you?" and you may reply "Good", even if this is not the case, because you don't want to tell them details of your problems.