The second is simply that any high technology civilization will eventually travel to the moon, which allows for a much more undisturbed record.
If we didn't already know where the lunar landers touched down, do we really think we'd be able to find them again with just a telescope? That's a lot of area to search.
The point is ... there is no question that our satellites would have found such evidence by now. We may not tell the general public ... but we would definitely have a good idea of where to look for evidence.
If we didn't already know where the lunar landers touched down, do we really think we'd be able to find them again with just a telescope? That's a lot of area to search.