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They are there to show that we evolved from animals with claws.
Our fingernails are still used for a number of things, even it they may be only scratching and teenagers picking spots.Toenails, however are not used, and grow at roughly half the rate of the fingernail. To me this suggests that the toenail is vestigial and will disappear in time.For now their only purposes seem to be to cause aggravation when trying to cut them, to make holes in your socks when you don't cut them and to cause great discomfort when they become ingrown.
When you walk without shoes on the toenails protect the tops of your toes from abrasion and other injury. They are handy just for that purpose. If you wear shoes all the time then they have no use. But we're not meant to wear shoes all the time. I'd rather have a scratched toenail that a cut toe. Wouldn't you?
Oh no have we been that domesticated?
The universe is without purpose.