Suppose B is about to do something unjust to C and A is in a position to actively prevent B from doing this with almost no effort yet A refrains from preventing B from doing what he intends to do, resulting in B doing the unjust action to C.
There is clearly something wrong with what A has chosen to do, but I'm finding it very difficult to pinpoint exactly what's wrong with it.
- It doesn't seem to me that A acted unfairly since to me it seems that for someone to do something unfair he must cause something to happen to someone that the person didn't deserve, while in our case A didn't cause anything to happen to C: he simply didn't prevent what happened to C.
- It seems to me that A is acting unsympathetically, but I don't think that this really accounts for how wrong A's inaction seems.
So, what exactly is wrong with A's inaction? Why should he help C?