Fact is, this programme is presenting an edited and 'shaped' view of Amish life. The children would behave in a quiet, dignified manner because they are on their best behaviour and aware of their duty to represent the best aspects of their culture.
I would suggest that the posters on this thread with personal experience of this way of being and those of us who have visited their regions without a film crew have a better picture of what goes on.
But a filmed light entertainment show is highly unlikely to provide us with a trustworthy and accurate depiction. The everyday 'boring' bits will not make the cut.
Re medical needs- my friend is an emergency medicine doctor and regularly patches up and admits Amish patients. They accept medical intervention and told my friend that medical knowledge that does good is Gods work. However the usual caveats apply-no TOPS etc.
The problems have arisen when Amish have been injured in hate crimes (quite common), suffered l'industrial'/farming injuries or involved in RTA's. As soon as a police report is requested, their desire to 'keep it in house' makes gaining witness statements rather difficult.
The co-operation with police over those Amish shootings causing multiple deaths a few years ago was patchy at best. it is not that they want to evade justice or punish perpetrators themselves; rather the belief that God provides justice.