My first reaction to the chapter was anger, I really like Matt and I felt like he is being mistreated. After taking time to cool down, re-read and look at the broader picture I can only congratulate for the writing.
I am still upset at what is going on, and I still feel that while the clan was very good at taking care of Will (and Wade) in the 9/11 aftermath the same can't be said for Matt. The impression I had is that his increasingly erratic behavior was mostly ascribed to immaturity and unwillingness to grow up on his part. I think Wade is right, Matt is scorching the earth around himself and I think he's on a self destructive path. What I'm afraid of is that everyone will be too busy being pissed at him (even though they surely are within their rights, Will especially) to gig help before it's too late.
It's not the first time that the family does not notice that someone is going off the deep end until it hits them in the face, I think something similar went on with Robbie's midlife crisis, I clearly remember everyone, especially Brad and Stef, being almost constantly pissed at him because of his whining and not really bothering in trying to see what was hiding behind.
Robbie may have been to emotional at times, but with his death I think a good chunk of the empathy the clan was capable of is gone.