The Horowitz report was carefully crafted so those pouring over it can take away from it whatever proclivities they may harbor. An accurate assessment of it (not mine) is the report is the Rorschach (test) ... it is open to interpretation and can be whatever you want to read into it.
When I was in the military and working on the occasional accident (or other) investigation - I saw this same scenario unfold: throw some middle management under the bus and let the higher ranks go free. Field grade officers were expendable. Flag officers were not.