That is a fallacy.If the sanctity of life is worth protecting, its worth protecting in all cases.
Sometimes taking one life protects countless others.
(and unless you are at least vegetarian....)
The exceptions nullify it as a moral precept. They make it arbitrary and relative. That's why the greater good is always used to justify the murder of undesirables. Sometimes morality forces you into tough decisions. This is one of them.
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The absolute of the tabu of taking a human life is offset by necessity of self defense or war.
We are not talking about 'undesirables' we are talking about people who have and will damage the structure of society with their own disregard for the sanctity of the life and well being of others.
This is not about killing retarded people, gays or communists, but putting dangerous criminals away for good. You know, those kinds that are a danger to even the staff of the facility they are being held at. (and no, I don't consider locking a human being up from 23 out of 24 hours and put them for 'exercise' into a small cage humane)