I am not going to argue the emotions here, but GD did not "TAKE" a pay cut, he was paid according to the term of his employment agreement.
I do not see anyting voluntary about it. If he elected to say...."dont pay me any bonus at all", even though the terms do say he gets some, albeit reduced, then you would be correct in saying he TOOK a pay cut.
Why large companies never see this I dont know, but if everyone received a bonus based on group performance (bonus=%of base salary for example), people would work together and those seemed or deemed to be leaching the system would soon have the heat on them.
Going away now......back in the corner!
Cheers
J