One course of action would be to copy and paste the comment into the email and ask them if they still wanted to submit the comment with their email in it. By saving the comment in this way, they won't need to go through the trouble of writing another thought-provoking insight. Sometimes people are not Internet savvy and a little consideration from a fellow Hubber can be a good thing.
However, that may not be the way to go. Many years ago I worked at a grocery store. A lady left her car headlights on. I "helped" by informing her of her oversight and she was appreciative.
A week later she did the same thing. I realized she had learned nothing from our encounter, so when she came out from shopping, she needed a jump. I bet that was the last time she left her lights on.
Sometimes natural consequences are more helpful than anything we can do.