Where do you draw the line? Is a company that manufactures mechanical pencils complicit, because they might be used as writing instruments at a coal plant?

I agree that accountability is a good thing, and we need to be doing more as a society to protect the planet. But at some point one has to come to terms with the idea that they're building a generic tool and simply can't be responsible for how others use it.

(I'd argue the blame primarily belongs on the plant itself, those who buy coal from it, and the government that allowed it to operate.)