Catholic moral teaching has become a fast moving target.
This is mostly due to ever changing medical technologies which enable us to progressively address those things which normally shortened human life, i.e. diseases, bacteria, viruses, injuries, etc.
The 2019-2020 Covid thing has thrust medical technology to the fore as few things have in human - and Church - history.
The Vatican is now telling us it is okay to get vaccinated with something that may or may not have been associated in one way or another with a cell line of which the origin is child aborted a half a century ago. (See here for more.)
With the "Vatican" seemingly all over the place on everything these days from the death penalty to same-sex unions, no one can blame us Catholics in the Pews if wonder WHAT'S UP?