Not weighing in on the side of abortion here at all, but it is a fallacy to think ethics/social mores have ever been clear cut or there is a resounding answer and consensus to any ethical issue. Things may seem that way to an individual, but across humanity and history it is not. Some of our current mores are outright bizarre for instance and inapposite of history or sound logic.
"Every life deserves saving despite any future consequence" - it's the current majority belief that even if the survival of a person will cause an elevated level of death and suffering in others, then we should ignore all outcomes and preserve their life against those they affect. [hedonistic/illogical]. This is a theoretical proposition, but lets say someone is patient 0 for a new virus that has the potential to kill millions. If private Carl shot patient 0 in the head, it would be considered atrocious, a murderer by most people. On the other hand, if patient 0 resulted in millions dying after the virus released, it is merely considered unfortunate, or a unavoidable tragedy. It has not, however, always been that way, it's a more recent shift.
On the other hand, just a few decades ago, if someone beat the shit out of a guy simply for being a gay, a good portion of the population would of at minimum, looked the other way, if not supported the practice. Yet, from a standard, or even religious perspective, it is, and always was, atrocious. We're not that far removed from all sorts of atrocious behavior, and it was all committed by people whom thought, and even knew, that they were "in the right". We're not that far removed from 75%+ kids having a background that involved either and absent, or an alcoholic or abusive parent. Yet its easy for people to look at single mothers or a divorce rate and say it didn't use to be that way (oh, it most certainly did).
Point being, ethics shift like tides and across societies way more than we acknowledge, even among those that argue it's always been crystalline. It's easy to take quick positions, it's hard to take truly consistent ones based on any sound principles across the spectrum of action and life.



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