You say you dont’ see why a moral issue such as contraception is necessary to be resolved? Hmmm… because it is a MORAL issue? That is what the Church is there for, correct? The only time in the Bible that someone ever contracepts, God KILLS him for it. Now surely that is good enough reason to at least think their might be something wrong with it.
Surely you would want to know if it was a sin or not.