What if, as we approach the Singularity, it is provably or near-provably necessary to do unethical things like killing a few people or letting them die to avoid the worst of Singularity outcomes?

(I am not referring here to whether we may create non-Friendly AGI. I am referring to scenarios even before the AGI "takes over.")

Such scenarios seem not impossible, and creates ethical dilemmas along the lines of what Yudkowsky mentions here.