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The dog is the only one that can't actually consent to space travel, and regardless, couldn't possibly know the risks. It is innocent, and doesn't deserve a violent fate.
Everyone else knows that they signed up to live in a metal box, with an artificial biosphere, which is all that separates them from the cold void of deep space. Also, said deep space is jam-packed full of things trying to actively break that metal box, if the crew doesn't beat them to it first. And nobody knows that better than Seven.
Seven didn't. At least not originally. Annika was dragged along by her parents out into the middle of nowhere to get assimilated.
Yes, she decided as an adult to continue her career in space, but she definitely didn't make that original choice.
Yeah, but no one gets to choose where they live as a kid. Her parents took her to a particularly dangerous place, but plenty of parents go someplace dangerous with their kids on purpose. It's basically abusive behavior, but it's also not like they ever lauded Annika's parents as heroes. They were pretty neutral on what happened.
We all live in outer space, out in the middle of nowhere. Everyone ever has, and will. And not a single one of us got a warning of the risks before they roped us all into this. Kinda messed up when you think about it.