Let's start with some basic concepts. You live in an age of lies. Every day of your life you are literally being drowned in lies. Lies by government. Lies by advertisers. Lies by the corporate media.
Truth has become such a valuable commodity that the government is economizing it!
Liars, meaning good convincing liars (i.e. sociopaths, who evince no guilt when they lie) , lie because they are able to get what they want from people, especially if those people are conditioned from childhood to tell and to believe that others will tell the truth.
It may seem that I am stating the obvious, but the point I want to make is that all ruling power is, is the willingness and ability to do things the ruled may not, or have been conditioned to believe they cannot do.
You are taught not to steal, yet government reserves to itself the right to steal, obfuscating the theft with words like excise, confiscation, pillage, taxation, and in the extreme, conquest.
You are taught not to murder, yet government reserves to itself the right to murder, obfuscating the killing with words like capital punishment, assassination, terminate with extreme prejudice, and in the extreme, war.
You are taught not to lie, and it stands to reason that in this area of human behaviors, rulers are as averse to the rules imposed on you as any other. As eager as rulers are to steal and murder, they are equally eager to lie to their people to get what they want.
In today's enlightened age of alternative media and global internet communications, lies by rulers are quickly laid bare. Yet most people remain trapped by their beliefs of what they imagine their rulers to be, and greet each new revealed mendacity with, "What? Our ruler lied to us?" The question more properly ought to be, "When don't rulers lie to us?"
Now that the bovine excrement is being flung at us with a snow-blower regarding the crash of Malaysian Airlines flight 17, it is worth recalling the fact that the US Government lies to us, not just once, j=not just a few times, but constantly.