They were children who grew up wanting to help people stay healthy when they're well and get better when they're sick. It can take time for children, in the clinical atmosphere of a doctor's office, to realize that the people looking after them have feelings, too - just as all people do. Her mother suggested that maybe the technician had been having a bad day, that maybe she had wakened feeling grumpy about something. When the technician laughingly reassured her that she was feeling fine, the girl held out her finger, ready to cooperate. Children need truth, for it's through truth that children can learn trust.
Some truths are easy and reassuring for grownups to give.
For instance, stethoscopes and otoscopes do not let doctors hear or see a person's thoughts. But it's also a truth that the hurt they cause quickly goes away. Knowing what to expect in unfamiliar situations is helpful for all of us, particularly if some of what we have to expect is going to be hard to bear. Invasions of personal privacy can be upsetting for children as well as grownups. In caring for our children, part of our hope is that they will grow to take care of themselves.