Why can an indirect hernia be controlled on physical examination yet a direct hernia cannot?

Indirect hernias protrude into the deep ring due to patent processus vaginalis. The deep ring lies lateral to the inferior epigastric vessels and this is where you occlude in your examination.
Direct hernia protrude through a defect/ weakness in

I think perhaps it is because as Dr Hutchinson says, in the normal examination scheme you would palpate for the deep ring, halfway along the inguinal ligament between the ASIS and the pubic tubercle and occlude here, thus preventing an indirect hernia