Don't Forget

Don't forget, if you leave a comment telling an author that they "forgot" to say this or that, to preface your comment with "I think everyone should tend to my agenda rather than expressing their own opinions, so here's what I would have written."

If your goal is to point out an additional detail, it can be done by simply saying "another thing to think about is foo," or "I'd also like to point out…" This allows you to contribute positively to the conversation without being that guy.