What objections might management raise to cooperating with labor?

As with my previous answer, I think that a lot of the
problem here is tradition.  Management has come to see labor unions as obstructionists
who care only for the workers and not for the health of the
company.

However, I think that there is another reason
going on here as well.  The issue here is that management, on a daily basis, has to
supervise labor.  The management has to act as boss and disciplinarian.  Because of
this, it is hard for them to want to cooperate with labor.  Managers, therefore, might
object to cooperation because it would break down the barrier between boss and worker. 
If this barrier is broken, it might make it harder for the bosses to supervise and
discipline workers in the way that they need to.

This is
sort of like the divide between students and teachers, parents and kids, and (military)
officers and enlisted.