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It's there for your safety!
The ground wire is an important safety feature. It ensures that any hot internal wire that becomes loose or frayed and touches the metal parts of the chassis (which you might touch) will be grounded. This will cause the fuse to blow, but will mean that the chassis is safe at all times. Some modern devices with plastic cases need no ground wire because the body cannot become live, even if touched by a hot internal wire.
If there is no internal short then the ground wire contributes nothing but safety potential.
Removing it will not affect the performance of the device but you may be contributing to the removal of stupid genes from the human gene pool (yours or your child's)
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