According to some, the Constitution does not mean what it says. We must remember that the machinery of government would not work if it were not allowed a little play in its joints. Either the Constitution means what it says, or it means nothing at all. Unfortunately, many in today's society believe that words don't mean what they say they mean. Even though that claim is demonstrably false, it has been repeated so often that many people believe it to be true.
Euphemism is also a political tool.
If we see the rhetoric of the left as flagrantly contradictory, then we are evaluating it by the wrong standards. For the left, words are not tools to convey meaning or truth. Instead, words are weapons. The purpose of using language is to gain political power. Logical consistency is not the standard by which leftists evaluate their comments.