We don’t live in such a society. We don’t rule everything out either. This is real life. The people fighting the war need to weigh the costs and benefits.
It’s obviously not all physicians who joined that chorus. The ones at The Hague didn’t object. The ones at Guantanamo, and the ones at various U.S. prisons didn’t either. But I doubt this would even be an issue if they didn’t do this at Gitmo.
In fact, if they never force fed at Gitmo, and the doctors allowed a couple hunger strikers to die, you’d probably see a number of the same people object to that. I believe it could be immoral to let a hunger striker starve to death if they’ve doing it out of peer pressure, which is probably what’s happening in most cases.