Unfortunately, while you may have "powned" him with your reply, it did not nuke his computer, delete all of his "victim" email addresses, nor make him personally physically incapable of returning to his life of slime. I like the idea of the SAS dropping in on such a person, turn his (computer) hardware into interesting confetti, and then commit various mahem on his cerebral cortex (if any) such that he could be trained to water the lawn or other simple task-but nothing more. Too bad they don't listen to my ideas.
In other words, I'm glad you didn't take the effrontery as just one more pebble on the pile and threw it right back at them, but I'm afraid it won't make any difference for the rest of us.