Just how can you reasonably expect everyone to have to have their experience on say an outing or event to be interuppeted by some child that cannot behave their selves? If they cannot behave themselves then YES they should be left behind. That is just as unfair to the other kids as it is to your child. Face facts everyone is not the same never have been, never will be. When I went to school they had schools for kids with mental and physical problems, seemed to work then..why change it. Every parent wants their kid to be perfect but realize they are NOT. You cannot force other people to always be politically correct some people tell it like it is, sorry if it hurts but that is life. Teachers are there to teach and not be some kids one and only support group, there are others also that need attention.
Children that run around like they are on speed and cussing out teachers and parents are not ADD OR AHDD or whatever the correct term is it is because they are not taught right and wrong from the first place and made to mind and act with some sense. It stems from BAD parenting, period. We never had kids act this way when I was a child because we had parents who would NOT tolerate it.
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