I think there is an experiential way to fix Lefties, at least those few with an open mind.
In the first lesson, the Lefty has to be very sick, something as horribly painful as a burst appendix.
The Lefty now goes to a public hospital emergency ward in a large urban area for treatment. The lesson will be learned while waiting for treatment in a room with homeless indigents who smell so bad, our Lefty will puck. These are indigents who regularly come to the emergency ward with self induced problems of over-dose and chronic alcoholism.
Indigents are such a burden on our compassionate care givers that our Lefty will immediately see that there is a cost to every non-indigent from our Lefty wimp view that indigents have to be treated just like everyone else and given massive public subsidies and unlimited tolerance.