Vatican Releases Seven New “Social Sins” and Re-Confirms How Backward It Is

The Catholic church's stance on birth control is one of their stupidest and most dangerous.
The issue at hand is, when does life begin? Does it begin at birth, at conception, somewhere in between? What the hell is life in the first place. Sure, I'm alive. Microbes are alive. If we all killed each other, but our computers where left running on solar energy, would an alien race come here and declare the computers to be life? Why shouldn't they? Especially if technology was advanced enough that robots where able to make other robots.
So the Catholic church believes that every sperm and egg is a human loved by God, that we should not intentionally destroy. But what is the basis of their belief?
My understanding is that it deals with a story about a man who was commanded by God to sleep with a woman and bear a child. Instead he went and jerked off. It's my understanding (and I could be wrong) that this story is the basis of their whole belief on this.
I think it is clear, from both a scientific and relgions basis, that there is no reason to hold sperm or an unfertilized egg to the same standards as a born baby. To say that would be to equate the millions of sperm that day naturally in a man's body on a regular basis to frequent horror. I'm certainly not weeping over all the sperm I've produced that didn't form a child. I don't care. There's no reason to believe that God cares either.
I do believe that most Catholics, including the Pope, really do believe that this is a humanitarian issue, but I believe their basis for that belief is way off, and not grounded in any sense of logic.