Have you explored alternate theories, such as "people seek to define in- and out-groups, and their punishment intuitions follow this model rather than any causal moral reasoning"?

BP is being punished because they are the current reminder that the world is riskier than most of us like, and this makes them an easy target to rally against. "they're bad people, take their stuff and give it to the good people (us)" is about the level of reasoning I hear from people who actually support such actions. It's very hard to give any credence to the more complicated rationalizations you give,