Right, I want to start off by saying I adore Johann Hari's writing. He's written fantastic articles in the past which sometimes teach me things I hadn't known before and other times resonate exactly with what I'm already thinking.
However, a while ago he wrote something that I didn't only disagree with but I thought was verging on dangerous. I said at the time I didn't agree with a lot of what he said in this article, including the dodgy uses of statistics which he apparently got from an article in the Guardian. My response apparently got me blocked, which I wailed about at the time.
A response to the article that I agree with [in words I couldn't hope to write] can be found here.