Perhaps the "straight mil retirees and career changers" have a better work ethic than most of the 'you-owe-me crowd of today' and this is the reason the regionals - fractionals - 135's etc prefer them.
As a career Police Officer, retiring in 3 months, I am looking forward to the view of DFW, or MCO or JFK etc from climb-out as opposed to cutting down a 20 year-old who just hung himself, or a 55 year-old wife who can't leave an abusive relationship. (the incidents are endless) I prefer to work for an organization concerned for their repective bottom lines, after-all, those will be the ones left standing when the music stops.
I would never presume to bad mouth my chosen career as some have done here regarding aviation. Law Enforcement, like aviation, like accounting, like basket weaving all have their respective ups and downs. How presumptious it would be for me to discourage an otherwise capable applicant because I made bad career choices. Shame on you. You know who you are.