I am going to guess you don't have children. I may be wrong, but I would be shocked that a parent would hold these beliefs. When you have an infant it is plain to see how infants use behaviors from the past that get them the results they want. That is what infants do. They are exploring the causal graph.
Not to say they never cry because they are scared, or hungry or a myriad of other things. The manner and duration of crying are things a parent can pick up on and your goal is to give the child what they need, not just what they want.
It is an arms race!