Earlier today, I came across a question that had an accepted answer to it, but the OP had asked for additional information which the answerer refused to give. So I decided to edit his/her answer myself, to add some content to cover the additional info the OP was asking for.

But it seems that because the OP asked for the additional info by commenting on the answer, my suggested edit was rejected?

Reason for disapproval:

This edit is incorrect or an attempt to reply to or comment on the existing post.

The suggested edit can be found here.

Why are users not allowed to do this? I mean, what's wrong with helping someone out when the original poster doesn't want to for whatever reason?