I can see how suicide causes all sorts of tormented feelings on the part of loved ones left behind. The simultaneous horrors of losing a loved one, having that loved one do something terrible, having him be the victim of something terrible, him having no chance to repent or work through the issue, thinking you may have lost him for the next life as well, along with the guilt our human nature foists upon us that we might have stopped it "if only I had...," all combine for a grim eulogy.
During her discussion of her son's suicide in In Quiet Desperation, Marilyn Matis makes this odd observation: "Although losing our son was difficult, it has been comforting to know that he was faithful to his temple covenants." I've heard this statement criticized as implying that it was better for Stuart to have killed himself than to have given in to his gay desires, but I don't read it that way. The subsequent sentence reads: "Fred and I each had an indescribable feeling of peace that lasted for several weeks after Stuart's death." How is such a peace possible given the horror of suicide? Given the sin of suicide?
It's as if Sister Matis sees the suicide itself as, well, not counting. I wonder if it was a spiritual confirmation that all the good Stuart had accomplished in his life was not negated by that one act. Or, perhaps, that he wasn't accountable for the act at all. Elder Ballard has given some guidance on suicide that indicates there are occasions when a person's state of mind excludes culpability.
In more general terms, Elder Oaks has talked about exceptions where one is not accountable for an action that would in some other context be grievous sin. Prior to the quote below he gave the example of a man who wanted reassurance from Elder Oaks that his involvement in military combat would not constitute a violation of the commandment thou shalt not kill:
...The explanation I gave that man is the same explanation I give to you if you feel you are an exception to what I have said [about the commandment of marriage]. As a General Authority, I have the responsibility to preach general principles. When I do, I don’t try to define all the exceptions. There are exceptions to some rules. For example, we believe the commandment is not violated by killing pursuant to a lawful order in an armed conflict. But don’t ask me to give an opinion on your exception. I only teach the general rules. Whether an exception applies to you is your responsibility. You must work that out individually between you and the Lord.
Perhaps Stuart's suicide was an exception, given the circumstances of his life and his mental health. Perhaps it is not inaccurate or inappropriate to find solace in the goodness of his life, e.g. in his faithfulness to his temple covenants. At the same time, suicides by those whose lives appear less worthy shouldn't be judged by anyone other than Him whose knowledge is perfect. And we can all have more hope knowing that "The dead who repent will be redeemed, through obedience to the ordinances of the house of God."