This isn’t about risk. It’s about the level of control you feel you have over the risk.
Whenever you read about a child dying in a house fire, or a a car accident, or indeed domestic abuse do you feel you should give up driving your children anywhere, or sleeping while your children are in the house, or living with your spouse?
The answers is generally no, because you feel you have control over how you drive, or how safe your home environment is for your child, and YOUR chosen spouse isn’t the child abusing kind, so you’re happy you have control over the risk, and terrible things happening to other children don’t impact you.
The heightened risk awareness issue with, for example, abuse in child care settings is not that it might happen (it’s very, very unlikely) but that you have no control at all over whether or not it does happen - it’s a risk you can’t moderate or mitigate by your behaviour.
So, you try to introduce some level of control - by, for example, proposing restrictions about who is allowed to be near your children in these settings. The fact that these make a tiny risk into a slightly tinier risk isn’t really important - the thing that makes you feel better is that you feel you have asserted some control over the risk level.
but this innate inability to measure risk effectively by parents is no reason at all to restrict 50% the population from an entire section of employment (and indeed wider social participation - if men can’t work in nurseries, they can’t work with small children at all…)