This seems like the most controversial bit here: > There’s a strange contradiction revealed by the naïveté and kindness demonstrated by humanity when faced with the universe: On Earth, humankind can step onto another continent, and without a thought, destroy the kindred civilizations found there through warfare and disease. But when they gaze up at the stars, they turn sentimental and believe that if extraterrestrial…
Tit-for-tat assumes a relatively equivalent level of negative outcome for each. There's very little reason to assume an alien civilization would be, and a few reasons to assume they would be quite a bit more advanced and with more resources. Responding in a friendly manner to a direct communication is a good idea. Telling your whole tribe to run to the beach and look at and call to the large wooden boat passing by on…
(Even more likely is the scenario where we're so far behind technologically that the best we can do is hope they're friendly; if they aren't, there's nothing much we can do about it.)
However, even if alien races aren't constrained by anything we would recognize as morality, we are (sometimes) constrained by our own morality. I think that's a good thing.