The only reason anyone cares is because of post WW2 guilt and oil interests. There are other places on earth in nearly the exact same situation (two unsupportable regimes both claiming sovereignty over the same region and committing war crimes against each other) and no one cares about them, let alone even knowing what places I’m talking about, simply because there’s no oil involved. The answer is fundamentally the same as when you’re walking down the street and see two drunk guys hitting each other. You ignore them and keep walking. Some people just want to do bad things and there’s not really anything you can do to stop them. By getting involved you inherently are forced to choose sides and now are supporting someone who doesn’t deserve to be supported.