If the first lockdown and the sacrifices we all made worked - then all that sacrifice has now been wasted as the minute the schools returned the figures have shot right back up. So basically, if the government wants the figures right down again, they can send every adult back to self-isolation but it simply won't work if they leave the kids in school to transmit the virus when they get home. Any further lockdowns will be futile unless the schools are shut.
As a disclaimer, I've absolutely no reason to want schools to be shut - I've nothing to gain, not even emptier roads as I'm retired and don't commute. All it is is seeing the bleedin' obvious in front of me.