My sincere sympathy to Ms. McBain and her family. 

"The dots are clear now," she writes.  And the first "dot" she lists, I believe, is the crucial one: "the untreated anxiety as a child that led him to self-medicate ..."  I may be naive, but "self medication" doesn't start until the person's able to do so--as, perhaps, a young teenager.  It's that untreated "anxiety"--a vague term--that appears to be the (childhood) problem here.  Yet, the focus is on what came next: drug abuse.  By then, I suggest, it was too late.  

About half-way through the piece I started looking for a mention of the root cause...and finally found it near the end.  "...in treating substance-use disorder and concurrent mental-health disorders..."  Concurrent?  Probably. However, Jordan appeared to have manifested symptoms years before "substance-use disorder."