Come on, the Ethereals are nothing like us. Sure, they're psychic, and they sound sinister. But they're all crazy about enhancing things with genetics and...well, they kidnap other species...but they do experiments on other...I mean, they're attacking structures that...well, they look really weird.
A lot of it comes down to perspective, and what you actually do with what you have. Frost has a point. Who is to say the Ethereals weren't a human-like race at first that became corrupted by their power, and that humans couldn't become the same. And I don't mean in a Purge movie way, or any of that shit, so don't you dare! I mean gradually, over time, where the pursuit of power makes you forget over time what is humanity, and you lose yourself to it over many many generations.
In the end (because, like I've said before, it all comes back to Batman), it reminds me of the origin story of the creeper in the DCAU. A reported who is driven mad by the same chemicals that made the Joker, but despite this, he is still a good man underneath, and fights for good instead of becoming another Joker. And hence the reason he is later seen in the Watch Tower in JLU.