Why this RUND MUSAND culture of living separate/divorced or teens away from parents?

How many widowers are there in Islam? How many people per year die from stonings, and honor killings? In case you are unaware, the Earth population is past 7 billion, we really do not need more people, the human race is not going to become extinct if some people choose not to procreate. The practice of marrying 9 year olds? what is that about.?