It’s a pleasant fantasy to think that it’s even possible in the places where it matters whether that is done or not. In Germany in the 1930s, for example, before the blitzkrieg had started, and even before Hitler had officially come to power, it was near suicidal to speak out against him. Yes, it was done – and the people who did that were exterminated, often before many people outside of Germany even knew who they were, and with little obvious effect on subsequent events. Their ends were (fortunately for them, at least) generally quick, but almost invariably violent.
That seems to be the way of things in the Middle East these days outside of Israel. Whatever opinion one has about Israel’s motivations and actions and politics, it generally doesn’t assassinate its internal critics. That is precisely what Hamas, ISIS and other military and quasi-military “organizations” do in Gaza, Syria and Iraq.
Between those bookends to my own life, the in-between conflicts of Korea, Cuba, China, Vietnam, Cambodia, Rwanda – you name the hot spot – “speaking truth to power” doesn’t seem to stop the power from doing whatever it wants to do, namely, dispatching those who dare to disagree openly.
And the USA, despite what its harshest critics say is not attempting to build political empire, and hasn’t since the early 1900s. (The Spanish-American war was probably begun and prosecuted with that specific goal in mind, and did have some of that effect, as the USA took over nations and territories in the Caribbean and in the Pacific Ocean – you should look up “Philippine insurgency” sometime for some eye-opening and forgotten history. But we seem to have moved past that, generally. And while we do make some ridiculous attempts to “export democracy” from time to time, we don’t as a rule attempt to wipe out all opposition, either internal or external.)