for most people that have a family, few things are more important. when you have dependents, many of your values and choices are different than they'd be if you are single. those choices tend to be more measured, more conservative, and less motivated by self-interest. the above example of a single guy owning a garage full of atvs and a corvette supports this.
every civilization every nation and therefore our af benefits from a large proportion of its members having the characteristics of a person "with dependents". there's nothing wrong with being single, but having a family brings balance to the force, is critical, and should be rewarded.