No, it doesn't make "right." It just wins.
There is a difference. Evil can win a fight if it outguns good, despite what you see in the movies. That doesn't make it "good" or "right." It just makes it the winner. And as far as evil is concerned, that's enough.
In the real world, it's the job of "right" to make sure it has the most "might." Ideally, I suppose, it should be "Might for right." T. H. White's "The Once and Future King" is largely about Arthur's attempt to work this idea out in a complex and imperfect world. The last chapter of the book is a very interesting read.