Now, I admit upfront that I do not understand the underpinnings to homosexuality. I don't think anyone "knows" for certain whether homosexuality is something you are born with or that it can be "acquired" somehow through societal elements, nor do I think it matters in this case. The issue here, in my opinion, is how Christ would have us use His priesthood.
Attempting to cast out homosexuality by means of the priesthood seems akin to using the priesthood to root out sin from an individual instead of helping that individual acheive the required change of heart. If Christ wanted it this way, why did He continually exhort His followers to "Go and sin no more"? He could have just cast out the evil adultery spirits from the woman, or cast out the evil hardened heart of the Pharisees.
Removing sin and/or faults from our lives is not as easy as calling the Elders of the Church and having them lay hands upon us. Repentance is a gift! Although difficult, and sometimes long, the repentance process refines us and makes us better. Without repentance, we would never be able to correctly channel the Atonement into our lives, whithout which, exaltation would be impossible.
In a situation like the one reported in Breitbart, to what extent can the Lord's priesthood bless the lives of others? Is the priesthood supposed to be used to tie the hands of the adversary? If not, then what is the point of dedicating a home by the power of the priesthood?