What I find disturbing about the "ex-vegan articles" is that it holds a mirror up to vegans as a group.
I've met so many wonderful people through my interest in veganism and animal rights. I've also met so many people I would have cared not to meet. Veganism/AR tends to attract people who are angry, pretentious, negative, overly-idealistic and sloppy with facts.
As computer programmers from an earlier error used to say GIGO ( Garbage In, Garbage Out ).
You get pretentious, negative, overly idealistic people who are sloppy about facts going into animal rights or veganism, so, that is who the ex-vegans are going to be. Same people, same qualities, just pointed in a different direction.
Before I get accused of being a hater let me just point out that I have been a vegetarian for over 30 years, a vegan for over 15 and a volunteer with several AR groups. I've met some of closest friends through these things.
I will admit this post is probably useless, beyond venting my own frustrations. A person who is being a __________ wouldn't be a _______ if s/he could see that s/he was being a __________.