Why are we born with 2 kidneys if we only technically need one to survive?
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It’s nice to have a back up. Some of our more smaller body parts have a redundancy in case of damage (eyes, testicles, ovaries, lungs, nostrils, ears, etc.). If one kidney fails, you don’t instantly die.
This might not work with something like a heart because that could be too complex/require too much food to maintain, to a point where it become a detriment. Instead, the heart is protect by the strongest part of the rib cage.
EDIT: Yes, I know that having two eyes, and two ears does more than simply provide a redundancy, but the redundancy element certainly helps).
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