Isn't it a bit like comparing apples and oranges?
Social care workers (chefs, taxi drivers, factory workers etc) work shifts, including nights, which puts you at more risk of just about everything, diabetes, stroke, heart disease, cancer, so I would think it'd increase the risk of dying or serious complications from catching covid.
Social care workers are less likely to be paid while off sick, and rely on SSP, which might mean they're more likely to go back to work sooner than they should.
They are in general lower earners, which means things like poor diet, poor housing, working a lot of hours and long shifts without adequate rest and travelling on public transport are more likely, which has a knock on effect towards recovery rates.
That's not to say that I think schools are safe, because I don't think they are, but teachers and social care workers are two vastly different groups, they're just not really comparable to me.