You can shout from the rooftops about the impact on our own T&C's that this is causing but lets face it to a 20 year old wanabee with no kids, no mortgage who just wants to fill his boots with beer and get through as many hosties as he can there is little reasoning. Changing bases is seen as an opportunity to travel and add to that the opportunity to fly around a jet and build hours quickly. We were all young once and I dare say that many of us had the same carefree attitude to life.
But I think the only way to curb this is for us to blacklist FR pilots from our own companies. Perhaps if they knew from the outset that if they joined FR then that would be their lot for the rest of their careers then some might rethink or heaven forbid MOL might have to improve the T&C's in order to recruit enough pilots in the first place. Some might even join BALPA and IALPA to try and improve their lot once they realised they couldn't leave. All this could be done very quietly on the sly without anyone knowing.