Great read. I just ran in to this phenomenon last week. I was having a conversation with an old classmate on Facebook. He had posted this article about how vaccinations cause autism and I challenged his opinion. His last correspondence to me was basically, "whatever, I have the right to protect my kids." which of course had nothing to do with what I was saying. It's hard for me to even make mention of how baseless his retorts were without getting annoyed so I will not get in to them. When you challenge someones opinion, it can really rock their boat. A quick shout-out to kleinbl00 for helping me during the debate. Much of the debate revolved around Andrew Wakefield, I reached out to kb for some source material and he provided me with this: http://darryl-cunningham.blogspot.com/2010/05/facts-in-case-...