Why is there no consensus about reopening schools?

Why is there no consensus about reopening schools?

“This is really one of the most perplexing and complex issues I’ve ever faced in 40 years,” says Dan M. Cooper, a professor of pediatrics at the University of California, Irvine. … Cooper, co-author of a commentary in The Journal of Pediatrics in May that highlights the need for collaboration between local schools and public health officials, believes, in general, that “schools need to reopen, and we need to study what happens in the schools very, very carefully.”