And that's often a good outcome. Consider for example this article published recently by a Connecticut state senator on why she wants to put people in jail for having 'fake weed'.
http://newcanaan.patch.com/articles/fake-pot-a-new-threat-to...
The entire article was riddled with sloppy thinking, and thoroughly plagiarized, so I got all of reddit to utterly destroy her until she deleted all of her comments and wrote a followup stating that the issue was no longer a top priority of hers. I tried to engage her respectfully first, but since she wasn't willing to engage in an intellectually honest debate then going out and fucking up her day seemed like the second best option. Overall I'd consider it a win. Sure it would have been better to get her to change her opinion, but once it becomes clear that no amount of facts or logic her will persuade her then embarrassing her until she shuts the fuck up becomes the best option left on the table.