Summing over actual violated boundaries is also a possible consequentialism, but it does not seem to capture the intuitions of those deontological theories which disallow you to push the fat guy. Suppose the driver of the trolley is a mustache-twirling villain who has tied the other five people to the tracks deliberately to run the trolley over them (thus violating their boundaries). Deontologists would say this makes little difference for your choice in the dilemma, you are still not permitted to throw the fat man on the tracks to save them. This deontological rule cannot be mimicked with a consequentialism that assigns high negative value to boundary-violations regardless of agent. It can, perhaps, (I am not entirely sure) be mimicked with a consequentialism that assigns high negative value to the subjective feeling of violating a boundary yourself.
Summing over actual violated boundaries is also a possible consequentialism, but it does not seem to capture the intuitions of those deontological theories which disallow you to push the fat guy. Suppose the driver of the trolley is a mustache-twirling villain who has tied the other five people to the tracks deliberately to run the trolley over them (thus violating their boundaries). Deontologists would say this makes little difference for your choice in the dilemma, you are still not permitted to throw the fat man on the tracks to save them. This deontological rule cannot be mimicked with a consequentialism that assigns high negative value to boundary-violations regardless of agent. It can, perhaps, (I am not entirely sure) be mimicked with a consequentialism that assigns high negative value to the subjective feeling of violating a boundary yourself.