Of the three, Manning and Winner, have been convicted (or pleaded) in a court of law, been sentenced to confinement, and served the time.
As far as I am concerned, those two have paid in full what they owe our society. Leave them be.
What would that reason be?
Pilots are unionized partially so that they have the ability to push back on unsafe practices without retaliation from management. Federal law designates the Pilot in Command as having sole authority for the safe operation of their aircraft, and the union side of things keeps management from being able to retaliate against a pilot for exercising that authority in ways management might find inconvenient.