Just that, really. Same as with SARS, as soon as schools closed, the infection rate dropped dramatically. I work in education and yes, some things need to take place on campus but for schools and most uni/college courses, remote teaching is perfectly feasible.
I have seen two people die of the mental health consequences of lockdown, with three more at risk currently and services underfunded, now only remote, and generally not sufficient. Am I the only one who things that as long as schools and most further and higher education isn't shut, there is no point in sticking to rules of another lockdown?