There is nothing sane, merciful, heroic, devout, redemptive, wise, holy, loving, peaceful, joyous, righteous, gracious, remotely spiritual, or worthy of praise where mass murder is concerned. We have been in this world long enough to know that by now and to understand that nonviolent conflict resolution informed by mutual compassion is the far better option.
The Catholic Church standing in "solidarity" with members of the LGBT community while condemning their behavior as "sinful" is a little like attempting to stand with two feet in one shoe. "Love the sinner, hate the sin" sounds really high-minded until you realize the only sin committed was being born different.
Terror doesn't change people from gay to straight. It just hurts innocent people.