Your "science" only applies to people who have families, mate. That much is clear by the nature of the claimed statistics. The fact of the matter is not everybody has immediate relatives. Some have abusive relatives, crooks, violent criminals, and the like exposure to which led many on a path to jail.

Your "statistics" likely don't factor in contact with family that includes habitual offenders, drug abusers, and the like. Where families are good, surely they may have some good effect. The errors are assuming family always exist and are always a good influence.

To say " Those who don’t have family or loved ones do significantly worse than those who do. " is to repeat claptrap that has been disproven by science. It's along the same lines as atheist children grow up to be immoral, which was also disproven.

I have plenty of family in law enforcement, justice, etc. I also have friends on the inside. I am no advocate of penal justice, myself.