Your statement isn't looking deeper at the issue. People in positions of power unfortunately need to lie to others sometimes, it's just a requirement of the job. If you are in charge of a serious group of people on a daily basis, you have to deal with a variety of things that demand secrecy/discretion, which in turn demands that you occasionally lie about things to others. In my opinion, reducing the impact of lying is a defensive tool that our brains are wired with.
What happens when an employee is accused of a crime or career-ending misconduct? Serious accusations must be investigated, but are often completely untrue... so you are going to be forced to lie to others point-blank if they hear rumors and ask you about it. Otherwise the rumor machine kicks in.
What happens when the company is in trouble and you need to seriously evaluate all sorts of different options, including laying off most of the staff? Again, you have to be careful to keep those sorts of discussions close to the vest, and that may require lying.
Studies like the Stanford Prison Experiment demonstrate that in certain contexts, otherwise normal people will become monsters capable of incredible evil. This is true, but it doesn't mean that we all need to curl up in the fetal position and cry. You have to have controls -- checks and balances to ensure that the powerful don't turn tyrannical. Those checks include training, delegated authority, evaluation with consequences and debriefings. Disasters like Enron, the My Lai massacre, and countless others are egregious examples of what happens when individuals invested with unchecked power are unleashed.