Sure; but the CIA also classifies "leading a peaceful, democratic political uprising" as worthy of violence; so they're not a very good guide.
They are not a guide so much as the very organisation for whom this sort of consideration is most relevant. They (or another organisation like them) are the groups most likely to carry out preventative measures. It is more or less part of their job description. (And puts a whole new twist on 'counter intelligence'!)
Which means, in the limit case, that you're reduced to either (1) going on a massacre of everyone involved in AI, machine learning, or related fields; or (2) resorting to convincing people of your views and concerns rather than threatening them.
Those extremes do not strike me as a particularly natural place to set up a dichotomy. In the space between them are all sorts of proactive options.
I'd be more interested in a response to the substance of my comment: 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?
In other words, how do you take into account the fact that killing them might bring about exactly the fate that you intend to prevent; whereas one more exchange of rational argument might convince them not to do it?
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?