More often than not, if someone is under-commenting, it's probably just out of laziness. However, if someone is over-commenting (which is possible in my opinion), chances are that it's because they believe that what they are doing is correct. Personally, I think posts such as this would be better to programmers in the latter category. A similar post aimed at the lazy under commenter probably would have no effect simply because such a person has been told they need to comment more throughout their programming careers.
That said, it really wasn't my intent to tell people they shouldn't comment. Rather, I'm merely trying to get people to think more about the comments they make. And that's not a bad thing all things considered.