It is not a fair comparison to lump Covid in with the other childhood diseases for which the US requires immunization. Even though most of the viral vaccines given are attenuated they do not result in disease symptoms and once the immune response is achieved, the immunity is complete and long lasting, or at least for the period when the child is at highest risk.
Seasonal influenza is a much more serious disease in children than Covid. Yet there have never been mask mandates, school closings, mandatory vaccination or anywhere near the fear mongering that the public is currently being subjected to. The current Covid vaccines do not protect against infection, disease, or transmission of the virus. Although they can be characterized as generally safe they are not completely safe. And they have only been demonstrated to be effective for a matter of months.