All laws and social order is idealism, by that logic. 'Just how it works' includes an awful lot of abhorant behavior. Doesn't mean you shouldn't fight against it even though, ultimately, it will never be fully resolved. Otherwise you start getting platitudes like 'murder never ends, why bother fighting it?'
But, murder never ends. So what are you fighting? To put a end to murder? To put an end to the existence of the mighty? If you kill everyone, I'd suppose you could accomplish both. Ironic that you'd both have to be a killer and the mightest to accomplish this.
Some see homosexuality as abhorrent behavior. How people view the behavior of other people doesn't change reality. Reality doesn't care what we judge as moral or immoral.
You can of course attempt to change the mind of the mighty. Doesn't change the fact that you actually have to change the mind of the mighty who hold the power and ultimately decide what is right.