So how many months/years are people happy for their kids not to get an education? Covid isn't going to suddenly go away. We need to live with it, not hide from it. What do people think is going to change that will allow schools to reopen in September as normal, when the same people think it's too dangerous to open on a very small scale in June?? Makes no sense.
By keeping lockdown a bit longer and keeping as many people as possible apart, hopefully it will give the chance for people who are already infected (but asymptomatic) to become non-contagious.
It will give the NHS time to adapt and plan resources and deal with the current problems (e.g. re care homes) without having to deal with an extra influx of patients.
It will give the time to develop a testing and tracing system that actually works (at the moment it looks as if tests are actually being lost and not processed)
It will give the time to source PPE and come up with firm plans for who needs to use PPE and when and how. Teachers and TAs and any other school staff can be trained.
It will give time to for teachers and TAs to plan how to teach effectively without the aid of objects (books, toys) which may transmit infection.
It will hopefully give some time to sort out the logistics problems in built-up areas: how do school children get to school safely in a situation where they would normally have taken the bus or Tube?
It will also give the time to come up with a plan that can assure continuing education for those children who remain vulnerable and who may not be able to return to school in September either.