Popes "declare."
That is one of their tasks: letting the 1.09 billion Catholics (Google) of the world know what they ought to know. It's an old Church that is STILL around after 2000 years so I GUESS the Church Fathers know what works.
The Churches position on abortion and it’s providers is very well established. Priests are in front of planned parenthood almost daily somewhere in this country praying for the end of abortion. It’s preached at Sunday sermons, articles are written in Catholic publications everywhere and there is no shortage of condemnation on EWTN.
Are you suggesting that the Pope is somehow not on the same page as the Church he is leading?