> no way that a civilization that developed on such a planet would not at some point endeavor to travel to those other planets.

That seems like a very human statement.

One could argue for a civilization to succeed it must be content with living on its home planet. And as a result, it would take good care of it.

You must be new here [on planet Earth].

Alternatively the parent considers the human race to either not have succeeded or to be in the process of changing to take good care of it

You could also argue that a civilization has not succeeded until it is able to completely sever ties with its home planet and venture out into the galaxy on its own. Leaving the nest, so to speak.