Ah yes, i forgot my childhood lesson of "don't disturb the dust on airless moons and planets".
But seriously, there is a difference between polluting the Earth and polluting the Moon. Not only is there nothing alive on the Moon. There will never be anything living on the moon unless humans put it there. If you are saying "The purity of the Moon must be kept!" then your principles are not something the majority of people would ever be interested in. I would rather see a giant corporate Disney theme park on the moon with Starbuck's coffee bulbs littering the moon-scape than a Moon that we cannot reach and left "pure".