You're ignoring the evidentiary value of his decision. If someone is pushed over the edge, that is good evidence that some antagonist has been doing more than the acceptable amount of pushing.

I feel like you didn't read past the first sentence of my comment.

I don't accept that one is responsible for how others react to their actions, no, at least not in the way that you suggest. That's the difference between moral agents and the amoral (natural) world. Aaron Swartz, to put it crudely, bears moral responsibility for what gravity and the rope did to him because gravity and rope are not moral agents. Carmen Ortiz doesn't bear moral responsibility for what Aaron did, because Aaron is a moral agent. Her responsibility begins and ends with her own actions, which were equally reprehensible whether or not Aaron chose to hang himself over them.