We did something about it in the short term, and since then we've stopped, so we are now doing precisely zero to prevent the long-term consequences of repeated covid infections, in children or in anyone else. Zero.
We've put all our eggs in the basket of thinking kids having lots of covid infections won't have any long-term consequences. What if we're wrong? The research into the cognitive effects alone should be causing concern.
Ventilation in summer and HEPA filters in winter in classrooms could have been being worked on for the last five years and we'd now be in a much better position, even if progress was slow because of funds and even if the results weren't perfect. If clean air is good enough for the Houses of Parliament, why not for children?