I think most of us fully understand these things and it is great information for new parents to have handy so they don't take it personally when they are asked to leave a child care setting.
As business owners, however, we have a duty to protect the others in care.
The biter typically has a parent or two who have the ultimate responsibility to parent their own child. Placing a "parenting" level responsibility on a "care provider/early educator" simply is not a feasible expectation.