And you will note that I didn't say "might makes right" I said "It doesn't need to be right."
I'm an atheist so not particularly interested in the moral aspect of ownership. "God says I own it really" is a hard argument to counter and if you go to Israel, its a very popular logic.
Moral doesn't necessarily imply God either. See the following:
mor·al (môrl, mr-)adj.
1. Of or concerned with the judgment of the goodness or badness of human action and character: moral scrutiny; a moral quandary.
2. Teaching or exhibiting goodness or correctness of character and behavior: a moral lesson.
3. Conforming to standards of what is right or just in behavior; virtuous: a moral life.
4. Arising from conscience or the sense of right and wrong: a moral obligation.
5. Having psychological rather than physical or tangible effects: a moral victory; moral support.
6. Based on strong likelihood or firm conviction, rather than on the actual evidence: a moral certainty.
Good, bad, own, property, right, wrong and moral, among others, are all concepts that describe things or are attitudes towards things which include descriptions other than their physical material characteristics (i.e. electrical, mechanical, magnetic, etc.).