So how do you treat those airlines that actively poach pilots who are type rated and trained by another airline? Surely using the arguments given above then the T&C's in the "poaching" airline should be better as they haven't spent the costs of training the said pilots. But it doesn't really work like that does it?
Airline pilots are just a cost same as cabin crew and maintenance and for most airlines are one of the largest figures in the P&L so naturally management will focus on ways of minimising this cost in order to raise profits. Whether this is encouraging SSTR's or taking away pensions, increasing working hours, taking away crew food etc etc.
Unions might help, strikes might help, BALPA membership might help but I wouldn't be putting all of the blame on SSTR's.