"Single payer also promotes healthy behaviors, diet and exercise since those are incentives to reduce costs."

Exactly, a social engineering gold mine. Nothing better for the elitist who feel they know what is best for everyone. A healthcare system that can be used to force everyone to comply the wishes and wants of the elitist or lose their health care. How long do you think it will be before gun ownership becomes a health issue under single payer? They try under Obamacare!