Not sure the Pope is the best source to be citing for moral clarity. He is not widly regarding outside of Catholic circles and even withing Catholicism his standing is rapidly diminishing for various reasons.
Pope Francis approval rating plummets among Catholics
https://www.lifesitenews.com/news/pope-francis-approval-rating-plummets-among-american-catholics-in-responsemichaelkelly8798 raises a fair point about scientific theories. Many people grab onto whatever scientific theory is currently in vogue and proclaim it as absolute truth. Often this is a way for the slower minded to avoid thinking about a topic. They just want to be told the answer. People who just want to be told the answer often get upset and angry when an answer they have already accepted is questioned.
Uncorrupted science is a search for truth. Plausible ideas and concepts that are not incompatible with current observations are scientific theories. Proven reproducible facts are scientific laws. Theories are often wrong no matter how many scientists ascribe to them. The trashcan of history is full of discarded theories that were once widely embraced by scientists.
michaelkelly8798, is a deluded automaton, he probably cannot tie his shoes never mind understand anything in biochemistry or biology.
Pope was just echoing what PAS (Pontifical Academy of Sciences) has been saying for years.