I did some looking at data - this might be useful:
I've just had a look at the ONS data on deaths up to 20th April by occupation. This was a report updated on 11th May.
At that point, 66 women who were carers, had died of COVID. 32 men who were carers had died of COVID.
They are not the largest occupation group by deaths, but they are comparable for school staff - particularlt LSAs/TAs or nursery staff, or special school staff.
Anyway, that's 66 women. 12.7 deaths per 100,000.
At that point, there had been 43 deaths of woman who worked in schools - 11.6 deaths per 100,000.
For men with those 32 deaths, 32 deaths per 100,000.
For men in schools 17.9 deaths per 100,000
You can't blame teaching unions, or school staff unions for trying to protect their members with those numbers in mind - we're not very different to care home workers, and they are wearing PPE and are NOW very much in the public sphere of concern.
Of course we don't know where school staff catch it, but same could be said of doctors or care home employees.