I disagree with this analogy. ‘Real life’ and the law of the land effect a population immensely, whatever a person’s religious background is - if they are lukewam, then they will be easily swayed.
Homosexuality was defined as a mental illness and illegal when most of the TCM films were being produced, children born out of wedlock were frowned upon and/or mothers were institutionalised, and the CC was held in high esteem. In other words some ‘sins’ were condemned, legally or socially, in that era.
Unfortunately, a lot has happened in between both legally and with the church.
I think it would be great to see priests preach on the topics above mentioned, however would it work in this day and age, with the ‘lukewarm’ brigade growing up and being indoctrinated by the media and through day-to-day life, that sinful behaviours are actually normal and acceptable, e.g. abortion, contraception, easier divorce and higher rates, SSM, etc, or would it distance the congregation even further.