T'Pol and Archer in “Unfinished Business”

T'Pol

Symbiots are living, conscious entities. We'll be growing a sentient being for the sole purpose of harvesting tissue.

Archer

I'm aware of the ethical implications. If we weren't in the Expanse, maybe my decision would be different, but... we've got to complete this mission. Earth needs Enterprise. Enterprise needs Trip. It's as simple as that.