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(1) Where indeed does the myth that atheists have no meaning in their lives come from?
(2) Is the myth that atheists have no meaning in their lives a product of willful misunderstanding? Why or why not
Atheists, materialists, physicalists, nazi's, communists etc. reject subjectivity. They reject reaching a conclusion about what the agency of a decision is by choosing the answer, resulting in an opinion.
Normally people relate to each other subjectively, emotionally, in regards to who they are, making the decisions that they do. So the one person expresses their own emotion about who the other person is. The expression of emotion operates by free will, thus choosing, maybe choosing the conclusion the other person is loving in making the decisions the other person does.
That means the conclusion that love is real is chosen, and that is something no atheist does. Atheists only accept the procedure of being forced by evidence to a conclusion, resulting in a fact, they don't do subjectivity.
Atheists don't express their emotions, rather they have a set of scripted ideas on what behaviours are loving, and if they see somebody conforming to those scripted ideas, then they will denote as scientific fact that this person is loving. To see if some behaviour is the same as some scripted behaviour is something a well programmed computer could do, there is no role for emotion in it. That is how the lives of atheists are generally meaningless.