It's more than just genocide, it's what happens whenever you let men have unfettered access to weapons to hurt and torture and kill. It's bloodshed and outright murder. And nothing in the world or in heaven above can ever justify it. There's only one commandment about any of it - "thou shalt not kill." (I'm not religious btw but, just saying). There is no exception because of "war," or because of freeing hostages, or anything else.