1) Yes, it appears to mean something like "do not satisfy the needs of the new efficient society", though it does not seem very clearly phrased to me. 2) Yes, or, judging by what comes later, perhaps something stronger than "leave", more like "be eliminated". 3) It means that the ideal (the "perfect idea") will justify the killing.
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NL8881) Does "who do not come into the new needs of efficiency"Who cannot adapt to "civilized" ideals of conduct and "moral" behavior.
NL8882) Does "and I take it they will have to go" mean "and I think that they will have to leave"?They need to be exterminated.
NL8883) Does "will have an ideal that