You found that this person dont deserve the merit points you gave to him, because of this post other members gave him some points, but you can do nothing to cancel your act!!! This is why I believe the merit system should be reviewed.
Well the award and the thread has generated some great discussions, and it has enabled a few others to earn some merits. I'll justify my award by looking at the good that came from my generosity.
ps. Talk Merit says - I hope the bugger gets banned as a result.