I KNOW most men who work in them are fine but sexual abuse in nurseries is overwhelmingly committed by men. No more men, much less abuse risk.
Yes we need more CCTV etc to watch bad women but it cuts SA risk immeasurably.
We can still have male primary teachers etc kids are old enough to speak up then.
And yes, you can ban on the basis of sex for safety reasons. In women's refuges, eg.