Biden was the elected official in charge. Regardless of whether he was actually in charge or just a figurehead means nothing. He takes the blame regardless.
Yes, it was very likely others in his administration were actually the ones making the calls and decisions, and they almost certainly knew Biden didn't know what they were doing. They also didn't care if he knew or not, they had an agenda to carry out to the maximum extent possible.
CATO makes excuses for what happened, it's that simple. Biden was responsible.
Truman had it right (note the sign on his desk)
Biden was ultimately responsible.