Covid policy was bad mostly because it was driven by economic interests, not because of "bad science."
The only major scientific lapses I can think of in the US were the initial insistence that masks don't work and that the virus isn't airborne. The mask issue was influenced by the fact that they wanted to conserve masks for healthcare workers. I strongly suspect the airborne issue was heavily influenced by no one wanting to deal with the consequences: that stronger measures would be needed to reduce the spread of the virus.
The only major scientific lapses I can think of in the US were the initial insistence that masks don't work and that the virus isn't airborne. The mask issue was influenced by the fact that they wanted to conserve masks for healthcare workers. I strongly suspect the airborne issue was heavily influenced by no one wanting to deal with the consequences: that stronger measures would be needed to reduce the spread of the virus.