imo it comes down to value, the only value to going to the moon was to say we did it first. you cant mine the moon we use to many resources just to get into orbit let alone use it as a form of consumption. if we put things to crash to earth say a big block of iron it would cause huge amounts of pollution in the atmosphere aswell as destroy where ever it hit. there is no ecenomical venue to be gained from going to the moon except political power