Whether "Abortion is per se contrary to the common good" is precisely the issue of contention. Some judge that the common good requires for the right of the woman and family and doctors to make judgements about it.

The Gospells say nothing about abortion, though the Church does. And whether everything in the Gospels woks for the common good of a present day society seems to depend a lot on how one interprets and applies a  passage. 

The attempts at living a Christian Communism was a disaster even for the Jerusalem Church. The Pauline communities had to take up a collection to bale them out of the consequences.