It's rather like saying "Management have decided.." It keeps the heat off one individual should the decision be unpopular. There is also the thought of keeping people in the dark over things and treating them like mushrooms. - Am sure imaginations will be able to finish off the expression without needing to put it in here.
Many of us realize that decisions mostly come from a collective body of no names. The oddity is that it is a method that has stood the test of time, yet, like so many things it is continually recycled with tweaks here and there. Then, when raised as an issue further down the track the blame is laid at the feet of the unknown body called "The Previous Council".
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Cool 
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