Literacy clearly eludes you:
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“those are the questions”.
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If Epstein killed himself in custody, particularly after having been put on suicide watch and then taken off, that is clearly negligence by the jail staff: QED. I suppose you could argue it was less than criminal – I dare you to try.
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“if somebody can prove he had help”
What part of plain English confuses you?
BTW – your use of “posit” is misconceived, since (lawyer-like) it creates a box into which anything else must be placed.
I’m not proposing explanations. I’m noting that if this or that is true, than the other thing (or something else) must be true.
That’s how actual investigations are conducted. You know, the stuff that happens before lawyers show up?
實事求是 means that you find facts, and build from them.