You are quite right. Not moving out and expanding is sheer long term suicide of the race. But alas, this idea must be sold politically. So let us sharpen up our arguments! Some scientific protection is warranted, but the Moon is needed as a source of resources, advanced outpost, and space base for expanding throughout the Solar System. Some parts of it may be closed off for occupation as reservations or such. Rocket exhaust will have to be coped with, however - so sorry.We can sit on earth and not expand out into space. That way we protect the science on lifeless worlds. Probably billions of worlds just like the moon throughout the Universe, but let's just sit at home till we become extinct. Alternatively we can ensure the long term survival of life by expanding outward and utilizing the resources of space. This planetary protection stuff is stupidity.