The connection with 9/11 is simply that the resarchers imply a commonality between post traumatic stress disorder and using disengagement as a coping strategy.
I found it interesting and relevent, that's it.

I agree that coping skills are necessary and I also teach coping skills to my children and utilize them myself.

You and I disagree on what we consider healthy coping skills.
I think it's fine to agree to disagree.