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"Snape was willing to let James and Harry die so Lily could live—" James hung him upside down naked from a tree when he was just a young boy; he doesn't has to be some f*cking saint. 🖕

Severus's moral failing in this moment - and yet it is still an understandable one - is he is willing to sacrifice Lily's child, an innocent baby, who's only crime has been to be related to James to Voldemort so Lily may be spared. His own desire to see Lily live clouds his perception that perhaps Lily would rather die protecting her son than hand him over to save her own skin, but again, given his fractious relationship with his own parents, it is understandable how he might reach this conclusion.

like writed in tags, Even during childbirth, the mother's life is prioritized; this is a fundamental moral principle that is even enshrined in our laws. Of course, the situation is not exactly the same, but it is still considered the norm.