Poorly labeled encrypted persons may well be destroyed. I'm not sure this matters too much.
It depends when the singularity occurs. It is also indicative that there might be other problems. Let us say that an AI might be able to recreate some (famous) people from their work/habitation and memories in other people, along with a thorough understanding of human biology.
If an AI can it should preserve as much of the human environment as possible (no turning it into computronium), until it gains that ability. However it doesn't know whether a bit of the world will be useful for that purpose (hardened footprints in mud), until it has lots of computronium.
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