Apologies and warnings in advance in case this is triggering.
There was an awful case a few years ago when a child had a fall in the playground at school and fell over hitting her stomach on something solid there. She went in to first aid saying she didn't feel well but there were no obvious injuries, but the school kept her there. However, subsequently her condition deteriorated suddenly and the school called an ambulance. It turned out she had a ruptured liver and, incredibly tragically, she died in hospital.
I'm wondering how that would translate for some of the posters here. Just to be absolutely clear, what follows is purely fictional and is definitely not what happened in that case.
Postulate a situation where things developed more slowly. The child fell over on the way into school, complained of feeling unwell, but the parents felt they had to get to work so crossed their fingers, shoved her through the doors and ran. Then half an hour later they get the call to say she's unwell and is lying on the floor and sobbing. Oh well, they say, it's probably nothing serious, and if it becomes serious the school will call an ambulance. The school keeps calling them to say she's still unwell, the parents say to themselves that it's probably only a bit of bruising, the school don't seem to be panicking, she's getting no worse. So they say sorry, can't get away from work, and put the phone down. Then the next call is to say that she's had that sudden deterioration, the school has called an ambulance. At that point, one hopes, they would suddenly find that they could get away from work. Only, because they haven't even started their journey back, it's still going to take them a long time. And by the time they make it to the hospital, she's died.
Yes, in that scenario she would possibly have died anyway even if the parents had taken her back home. But imagine being the parents, living forever with the fact that you put your work first, and because of that your child spent her last hours in pain and looked after by strangers without you there.