If you think that a person is about to turn on a (to your way of thinking) insufficiently Friendly AI, such that killing them might stop the inevitable paperclipping of all you hold dear, how do you take into account the fact that they might have outwitted you by setting up a dead man's switch?
If someone with a facemask is pointing a gun at you he might just want to present it and ask you if you want to buy it, the facemask being the newest fashion hit that you are simply unaware of.
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?