A bit off topic but it might be an idea to move away from men's nipples [1] as an example of redundant evolution. It's true to say often an evolution trait has no obvious reason, possibly the reason no longer exists.
Most every community have a tangle of a belief system outside of anything religious. Moving away from more obvious isms, I grew up surrounded by fierce ageism especially in regard to the dating set. As young adult I eventually realised it was another ism that was BS, but also realised its presence waxed and waned over a number of years - it's clearly a product of social interactions.
Men's nipples are probably useful for the same reason many electronic products have various things on their circuit boards that aren't used: on those products, it's cheaper to manufacture a single circuit board to cover multiple variations of the product, and just attach the components needed for that particular model, leaving the rest unused. Genetically, it's probably easier for men and women to just share the same genetic code that produces nipples.
Exactly, it would take a costly mutation with dubious benefit - and since there is no selective advantageous pressure (men without nippples arent that _more_ attractive, definitely not enough to warrant the mutation) they continue to exist.
I understand but it was less fun to go down the shared male / female development path of why men end up with nipples :) The fact that men can lactate under unusual conditions has made me rethink using the idiom "as useless at tits on a bull" ... but I'm fairly sure that a bull would not let a hungry baby calf nuzzle long enough for it to find the bulls nipples.
Most every community have a tangle of a belief system outside of anything religious. Moving away from more obvious isms, I grew up surrounded by fierce ageism especially in regard to the dating set. As young adult I eventually realised it was another ism that was BS, but also realised its presence waxed and waned over a number of years - it's clearly a product of social interactions.
[1] https://www.scientificamerican.com/article/strange-but-true-...