I am NOT a military pilot
From reading some of the information this was a dual hydraulic pump failure. Both right and left engine hydraulic pumps failed. The implication is this seems to be a known weak point. (Experts on the T38 would have to comment.). However redundancy can be an OK way to mitigate a weak point in a system. My guess is that on the risk matrix a dual hydraulic pump failure would be a 5X1 meaning if it happens it is mission ending —that is a “5”. But the probability of it happening is very low. That is the “1”. Again, T38 expert would have to weigh in, but my experience is there is no perfect aircraft. This is all very unfortunate. The system failed, the design for selection of dual ejection had issues and then the emergency procedures were not fully accomplished. Most tragic failures have a stack up of issues like this.