He joined the dark side a long time ago.
Yeah, but it's still useful to bring up as a cautionary tale.
One can have disagreements, but in distancing yourself from others due to a disagreement, one shouldn't walk off the face of the earth. (See that - I'm an anti-science flat-earther!)
Also, the name he gave to his own website was an early clue that not all was well in Johnsonville.