I think that this is an important question for many UU's. The poem is about the necessity of confronting the reality of suffering before it can be moved beyond, or redeemed. For over 10 years, I have reading and re-reading this poem because it shows, but does not explain, the redemption of suffering without explaining it.
The reality of the world is that there is much unjust suffering, some at the hands of human beings and some at the hands of fate.
Somehow, that suffering can, in some situations, be redeemed: creating compassion in others, gratitude. Witness the many nurses who deal with death and suffering all the time, but become even more compassionate as a result, and not more callous, which might well be a more probable result. The fact is that some suffering is redeemed -- Mandela comes out of prison not seeking vengeance -- people forgive their parents' shortcomings and even cruelty and are better parents to their children. Why does this happen some of the time and not all of the time? There is no adequate explanation for it, but that is the reality we are dealing with.
The communion story is one that says that God is present in the redemption of suffering.
I don't think (nor do I think I have ever preached) that God is in the suffering.
I don't think (not do I think I have ever preached) that believing that God is present in the redemption of suffering causes more suffering; that would be like thinking that ambulances cause heart attacks and life-threatening accidents.