There's things they're up to I don't know about. But that's why I requested Lotor's computer from Santa, and now I'm hacking it. But given the Galra are up to genocide (among other horrible things) to further their own power, the consequences of sitting around are intolerable.
But, I can't say for sure the universe would be so much better off if the Alteans had won that war 10,000 years ago, since in that dimension (one of them, at least), they've enslaved the rest of the galaxy with mind control instead of killing. Life without your mind really isn't much. So, under the wrong circumstances, lots of people can do awful things.