The system has created a standard for normal intelligence and anyone who doesn't fit this definition is branded as mentally challenged, autistic or learning disabled in some way.
Human life is big and abundant. The school system's definition of normal intelligence is narrow. Any individual's purpose in life is to become who they are naturally born to be. Some kids are great with animals. They have a special touch. Some are born creative, esthetic, athletic, visionary, sociable, good with their hands, etc. but they're not inspired or naturally good at the normal definition of intelligence.
It doesn't mean they're stupid or inferior. It just means they have their own talents that do not fit into the standard skills of a grade school education.
This is why I'm telling all parents of kids who don't seem to be successful at a normal grade school that you can't believe everything the supposed mental health experts and school authorities say about your child.