The Church stands against same-sex marriage and abortion on demand. It is seen as an enemy by much of the left. An obstacle to what they want.
The Church in America has been a tool of the liberals for some time. Support of socialism combined with lukewarm pro-life attitudes and action emboldened Catholic Dem politicians to play to their party's left wing. Bernardin thought, as McCarrick and still others do, that the "seamless garment"theory would rule Church teaching. Happily, the laity will never go for that.