There is a difference between performing due diligence before leaving your child in the care of strangers versus simply being a nervous mother leaving her child at school for the first time.

I don't care if a kid is 4 or 14, they are still children and as parents we have an obligation to ensure that who ever we entrust their care to (whether it is a teacher, nanny or driver) are competent not to mention not abusive. I would investigate (and have done so) to the best of my ability any institution or personal care giver before relinguishing my children to their care. If there was even a hint of a problem, I would not leave them there.