I think that some people (though probably very few) might be okay with that, but most people probably draw the line at cannibalism even if they don't respect human life.

Really, your question just illustrates the fact that this debate is entirely subjective and based on emotion.

As a further thought experiment, we're obviously already working on growing human organs for the purpose of organ transplants. Would people be ok with growing individual human organs for the purpose of food? I expect most people would think that would be gross and be against it, but ethically it seems in the clear.