Conspiracy nuts need to shave more often - I hear Occam makes a fine razor? :-)
As others have pointed out, it's likely Ceres has a fairly dark surface covered in dust/grit/alien-poop etc, much like the comet the Rosetta mission is currently molesting. Many of the pictures released to the public are 'over-exposed' to make it look slightly less like a lump of coal being photographed in a cave without a flash. The bright spots I'm (educationally) guessing are probably relatively fresh impacts from smaller chunks of crapola floating around the belt that have blasted away the dark, crusty surface, melted some of the ice which has re-frozen fairly smooth and so simply reflects more light. Thus appearing as bright-spots as the image is lightened for visual consumption by us flesh-bag Earthicans.
Well, that's my crack-pot theory and I'm sticking to it.