wedrifid comments on Counterfactual resiliency test for non-causal models - Less Wrong
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How do you judge the plausibility of a counterfactual?
You say "we can imagine" some of these scenarios more easily than others. But our imaginations aren't magic. There are plenty of things I can imagine that on closer examination are virtually impossible. And plenty of real things that I couldn't imagine until I knew about them.
If we had a good causal model, we could apply it. But we're usually interested in non-causal models precisely when causal models are intractable.
If the counterfactuals' plausibilities boil down to "I said so", then so does the entire argument.
It depends what kind of argument is being made via presenting the counterfactual. If it is challenging the generalisability of a strategy (like a moral system or a decision theory) then an implausible counterfactual is just what is needed. Plausibility would be a distraction.