It tells us how little this administration cares about legislation initiated by the vote of the people or their most proximate representatives, for example. If it manages this, then what else that the people want will it seek to destroy?
For the Catholic Church it will first of all be a scandal to the young. Jesus did issue a warning about that. What is marriage if it can be profaned and denigrated in this fashion, and how does one teach the young about its sacredness with the elites of society telling them the exact opposite? To secularists, of course, that wouldn’t matter, but to Catholics it certainly should.
Ultimately, will the Church in the U.S. find itself sued by the government for refusing to perform homosexual marriages against conscience? I realize liberals hoot at that, but the government most certainly did try to claim authority to tell the Lutheran church who its ministers are or are not, and did attempt to force Catholic institutions to provide abortifacients to their employees. That attempt is still going on, and while I don’t think Congress will overturn the Hobby Lobby decision, it won’t be for lack of Democrats trying.