If we go into schools pretending children up to 18 cant spread the virus its going to end up being more disruptive for children. Your going to have random groups of children missing 2 weeks of education, random teachers going off
Schools and hairdressers are not the same. Hairdressers you have maybe 4 clients in at once, all can wash hands/wear masks, chairs wiped down between clients. Adults dont touch their mouth/dribble in the same way children do. Teenagers all bundling each other/kissing each other etc. Teenagers touch each other a lot, way more than adults.
Hospitals are not even the same, waiting rooms are socially distanced, clinic rooms are kept minimal to allow ease of wiping down. Everyone wearing masks, chairs/door handles etc. All wiped down constantly. Clinic rooms disinfected between each patient. Clinicians wearing PPE. Hand sanitising everywhere, our hospitals have put in additional sinks to allow handwashing plus a good supply of disposible masks
A ward has less people on it than a year group. And even then the staff are wearkng PPE, constant hand washing, proper cleaning beds between patients, no/limited visitors. A hospital has less mixing of people than a school, and a hospital is much better at infection control in general.
Does no one remember norovirus outbreaks in school when you were children? Once there was only 4 of us in the class because everyone got bloody noro. Even secondary children would be running out of assembly to vom etc. At least in hospitals you can isolate wards