This. The cost of getting there, back, wages, insurance to name but a few - you'd need to be mining something you can get ONLY on the moon, essentially. And you'd need a damn good reason for needing it.
Not true. We need space resources, they don't need to come back to earth, so cost of resources on earth is meaningless. It's the cost of launching resources to space that it will have to compete with, at least in the foreseeable future.
It's inevitable and it's a good thing. So many things in space that can solve issues here, if you can mine in space you can build massive solar farms as one example, where sun light is 5x stronger than at sea level due to no atmosphere and shines 24/7. In the long term you could send rare earth minerals to earth. But for the foreseeable future. Space mining will be to open up space, not to bring back to earth.
There's also hundreds of satellites that cost several hundred million each, yet have a life span of less than 2 decades, as they run out if fuel, it's not economical to refuel them from earth. However mine water in space, split it and have automated vehicles to re fill them, is a real possibility in coming decades.
Op what are you destroying on the moon? In the normal sense there isn't really anything to destroy, there's no eco systems, there's no such thing as pollution etc.