Would you mind posting your reasoning
Timescale of life as we know it continuing to exist: Short
Timescale of killer asteroids hitting earth: Long
Are we running into definitional issues of what we mean by "life as we know it?" That term has some degree of ambiguity that may be creating the problem.
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?