Well, if you are going for the tautology awards, you should've said that they cannot be justified. At all. Which is true of course.

Hence the use of the word "should" in the question. Separating the descriptive reality with personal motives might help you get it. I don't think anyone in their right mind assumes there are objective moral truths, so yours is not a discovery.

The second problem with that word game is the concept of "power". What is it? Who has that? You only know this after the fact, not before it, so it's double-plus-redundant.

Being a living thing is about mere preferences.