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I think the legal concept of mens rea or a similar concept is applicable here. For example, I'm a type one diabetic and will cut off a friendship with people who vote republican because they agree I should not be able to afford insulin. My grandparents vote republican because taxes and don't consider the other effects.

Basically it comes down to intent and knowledge for me. If causing harm is part of why someone voted a specific way I think that it's fair to hold them partially accountable for that harm then it is carried out.