As George Orwell has shown us in his essay Politics and the English Language, when political factions or the government want to make us think in a certain way, they rely not so much on rational arguments or factual evidence. Rather, they do it with language.
And, since people think in language, whoever wins the language battles will tend to have their way. For example, those who advocate killing children in the womb first took refuge in the medical abstraction “abortion.” Later, that word took on a somewhat negative connotation, so those who advocate such a thing stopped referring to themselves as “pro-abortion.” Instead, they became known as “pro-choice.” And what freedom-loving American could oppose that? Now, even that term is being supplanted as supporting “reproductive freedom” or “supporting women’s health care.”