People, on the right as well as on the left, who say something like, “If the Church doesn’t teach what I think is right, I’ll leave… or I’ll fight against that teaching… or anything similar” they lack faith. The faithful sons and daughters of the Church look to Her for teaching and guidance. It is not our place to judge every decision and look for “errors” — which are really just points where we disagree — to complain about.
Those who are living lives contrary to Church teaching can stay in the Church, go to confession, pray and struggle to live up to that teaching. But they cannot engage in civil war, and fight against the Popes, Councils, Magisterium, and essentially the Church.
If you need a Church that conforms to your will, leave. You don’t really have faith. I will say, to those few who might listen, Reconsider your position and decide to accept Church teaching on faith. But these persons publicly proclaiming that the Pope is wrong and a hypocrite and that they are leaving the Church because of him, are not likely to change. They are acting on pride, and faith requires humility.
If you have trouble accepting what the Church teaches, but you have faith that Church teaching is from Christ, stay and work things out. Anyone who is absolutely obstinate that the Church has erred gravely (and especially in longstanding teachings) is just kidding themselves if they think the Church will change.
The Church can bless individual persons. The Church cannot bless gay couples who are living in sin, as it would clearly cause the grave scandal and misunderstanding of Church approval for sexual acts outside of a valid marriage as well as for unnatural sexual acts (which are not even moral within marriage).
Why can’t the Church give permission to priests to bless a gay couple who are living chastely? It is not possible to determine that the couple who publicly identify as, for example, two gay men in a loving relationship living in the same domicile, are not having sexual relations. This would cause grave scandal, as many would interpret this permission as allowing any same-sex couples to be blessed. Those who oppose Church teaching would use this permission bless all same-sex couples. It would be interpreted as a step towards blessing all same-sex couples and as a step towards approval for gay marriage. Some gay Catholics would then live according to the end toward which the Church seems to be moving. If the Church gives the impression of moving towards eventual approval for same-sex marriage, gay Catholics would marry in anticipation of that approval (which would in fact never happen). The problems and harm that would be cause by such a blessing — which is in no sense needed for the path of salvation for anyone — far outweighs any good that would be done. And that is especially true since an individual can ask for a blessing.
A gay Catholic who wishes to conform to Church teaching, should go to confession, and then ask the priest, at the end of confession, if he could give the individual a blessing at some time. Any priest would do so after a good confession, even a very conservative priest who knew the person was gay.
So nothing is lost to the chaste gay couple. Also, it is not common practice for Catholic heterosexual couples to ask for a blessing, nor is it common for married couples to do so. This is not something that very many Catholics receive, that is being denied to gay Catholics.