It's clear he supports the TSA to "stop planes from getting blown up." Since the majority of HN doesn't agree with that sentiment (at least that's how he paints it), he's sort of being a baby about it and quitting because he can't handle disagreement. He masks this fact very thinly in a what is definitely a stereotypical flameout post.
Communities disagree, and they're not all perfect. Nothing new there. If there was no disagreement on HN, it'd be boring.
Guardians are also inclined to respect authority, which may also be part of his aversion to anti-TSA stories.
Tools like Myers-Briggs are great for looking at yourself, understanding your strengths and weaknesses and learning to be a better person. However, when you start using them as weapons, the focus becomes other people's problems. I guess the benefit is you don't have to worry about self-improvement anymore when a personality typing system makes it so convenient to place the blame somewhere else.
I must admit that I do judge people harshly for several Guardian characteristics, but I realize that those characteristics are also (in many cases) strengths.