Earlier quoted context omitted.
Cognitive dissonance actually refers to the excessive mental stress and discomfort suffered by holding two opposing ideas in one's mind at the same time. Since these people don't seem to be particularly discomforted by this, the term 'hypocrisy' might apply better.
I think it's legitimate to talk about cognitive dissonance here because it explains the behavior patterns. When I was a kid I hung around a farm; on the inside of the wooden fence was a wire that regularly got an electric pulse. After the first time it bit me, I spend a couple of weeks being very careful not to touch it again. Hypocrisy can happen in a variety of ways. But there's a particular sort of doublethink and…
First off, cognitive dissonance does not explain any behavior patterns other than those prompted by feeling distressed. If these people were exhibiting symptoms of depression, distress, confusion, etc, or were making their decisions under duress of emotion, you could classify it as cognitive dissonance. But the examples given don't paint the people as particularly distressed.
Doublethink is actually almost the opposite of cognitive dissonance, and is the more correct term for the behavior mentioned. Doublethink is when there is absolutely no conflict in the mind about the two conflicting ideas being held at the same time.
Denial is also a different idea, and probably not completely out of context for the individual's reasoning, but does not describe the behavior. Denial is when someone finds an idea so difficult to accept that they reject it in spite of overwhelming evidence to the contrary. In this case the person's opinion might actually be weighed on various information that seems credible, and so denial might not be a factor at all.
The reason I chose 'hypocrisy' to define this behavior is because it requires an act that is in direct opposition to the values one espouses. In this sense the major difference is that you don't have to hold two opposing views in your head (whether under distress - cognitive dissonance - or not - doublethink). You simply have to say you believe one thing, and do an act which is directly in opposition to that belief.
You seem to be conflating all these different concepts into one giant over-reaching idea. This is probably not a good thing to do throughout life, not only because you're failing to communicate properly by misusing words, but you're actually simplifying a set of complex behaviors into one single idea to make it easier to comprehend. This leads to all kinds of cognitive bias and illogical conclusions.