My point is why take it out on the other children who were not at fault..By stopping it..

Probably because it has been brought home to them that it is simply not sustainable.

There will be many good justifiable reasons why a child may take a day off school but no way of judging which absences would not count and which would without an element of rough justice and thereby resentment appearing.

They are not taking it out on the other children, not being given something is not the same as having something taken away.