at least twice that I have noticed you have edited your comment after the reply has been posted, without posting any acknowledgement of same.
I do this all the time. There is always room for improvement, and notes about edits are ugly. I only leave them on comments that were later discovered to contain errors that matter for the discussion, and in that case I leave the errors in place, only pointing out their presence.
Act on caring about implementation of version history for the comments if you want a better alternative.
It's probably easier to build an uncaring AI than a friendly one. So, if we assume that someone, somewhere is trying to build an AI without solving friendliness, that person will probably finish before someone who's trying to build a friendly AI.
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further edit:
Wow, this is getting a rather stronger reaction than I'd anticipated. Clarification: I'm not suggesting practical measures that should be implemented. Jeez. I'm deep in an armchair, thinking about a problem that (for the moment) looks very hypothetical.
For future reference, how should I have gone about asking this question without seeming like I want to mobilize the Turing Police?