As jgl says this did not require hindsight. Did you not read about covid ripping through care homes in the UK, USA, France, Italy, Spain, etc? If you read about it then surely someone in charge of managing covid here did. And ignored it.
As njstone posted, the UK priorirltised the elderly for vaccination over a year ago. In the Philippines the same, group A2 just after health care workers. I am.sure every other country did similar.
So it was not lack of hindsight, it was all totally obvious and visible. The deaths are on their hands.