Yes, why is an open ended question, but there are better and worse answers. In this case we might ask, are they better or worse off making the journey than the

Yes, why is an open ended question, but there are better and worse answers. In this case we might ask, are they better or worse off making the journey than they would be staying at home? Do they gain something from all of that effort? A more genetically diverse mating pool? Or could it be that it is worse, but they are stuck in a nash equilibrium where any single deviant would be worse off, so there is no viable path to better behavior. Or is it their behavior suboptimal, even for the individual, but remains because so much is built on top of it that it would be hard to "refactor" the genome to remove the assumptions of a journey?