It is bad to not keep a child back who isn't ready. Just as it is not passing someone ahead who is ready. When I was young, I was reading trigonometry books at the library, but had to say in addition/subtraction classes with my fellow classmates. By the time I was in 9th grade, I was doing my older brother's drafting homework and creating battleship designs for the Navy. Being held back gives people such as me less confidence because we're denied the ability to do what we dream of. Unfortunately, I'm incredibly smart and have no way of directing that intelligence since I'm so used to being forced behind others.

Then I have the ability to act stupid and say "RELEASE THE KRACKEN!!!!!!!!!!"

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Some people walk in the rain, others just get wet. ~Roger Miller