Viability.
Leftist ideology is underpinned by tenets which are constantly refuted by outcomes of their implementation. This means that lying, pretzel logic, subterfuge, revisionist history, and lately their most valuable tactic, CHANGING THE SUBJECT, are necessary to maintain and propagate.
Leftism rests on emotion, not logic; therefore viability and propagation can be maintained and fostered with mere rhetoric. What they say doesn't have to be true, it just has to be stated in order for the faithful to continue the willfull self-delusion.
Fine post. I'm going to "steal" it and use it on some others I have been argueing with on some other threads. They are using the same logic described in your post.
And they are pretending to be conservatives.