You don't have to trust the universe exactly, you have to trust people like me who are watching them every minute. I cannot even begin to tell you the amount of emphasis given to security at the school where I work and the schools my daughters attend. I don't know how it is in your neck of the woods, but in ours, it is a huge, huge part of our jobs here to keep the children safe. If we have to choose between the academic objective and a safety one we choose safety.
I am sure the teachers down under feel exactly the same way.
We do- and teachers here work the same way.
My point is, sometimes our kids are out of our sight, and in these sometimes [tragic] accidents can and do happen.
The Mc's only crime at this stage is leaving their kids alone.