Some people actually have conditions where these mechanisms don’t function properly. This is often hugely disadvantageous, leading to much greater injury, because it allows the individual (knowingly or otherwise) to exceed the limits the discomfort would place on them. Tearing a muscle, or failing to treat a cut. Babies with no sense of pain can significantly damage their eyes simply by curiously poking at them with their fingers.
By that same token, if we could switch them off at will, we could cause ourselves harm for convenience. This is a survival risk.
Pain is a much more basic thing than thinking. Being able to experience pain stops us from making things worse, even if we can not think. That goes for animals, and babies, and anything else.
Thinking is much more advanced and is not related in any way to those older systems, such as pain. They are not connected. So you can’t control them by thinking.
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