It's all very well saying "fuck people's holidays", but actually the retention situation for teachers in England especially is really dire right now. There are a lot of teachers who are on the edge of quitting and "fuck people's holidays/weddings/main chance to see family" is a thing that could tip them over the edge.
Also, GCSE and A-level results do follow students for life. Is it fair to be saying "fuck people's futures" too.
If I'm expected to work over the summer, I won't be sending any work home or doing marking. If I'm expected to do that, I won't work over the summer without extra pay.
If you want schools shut now, then fair enough- but don't assume it'll be easy to make time up in the summer.