Wow. that is the most defensive letter I have read in a long time. Seems that someone had a nagging doubt somewhere in their head that got seriously raked over the coals when they ignored the "advice" to not do any internet research and read what they did!
This person also goes on the popular assumption that no one would just voluntarily walk away. Anyone who departs such perfection as exists in the organization just can't take responsibility for their actions. That is exactly the stance that is drilled into them to keep them under the thumb of the organization. It is so sad to see people like that. But as others have said, he seems to have the curiosity to read on his own, causing him to look at "forbidden" information. Maybe he will be fortunate and just open enough that what he reads will break through and open his eyes.