The point is removing body parts before they get infected, because there is a small chance they'll get infected is idiotic. There's plenty of downsides to being circumcised, like caratanized glans, leading to reduced sensitivity, and difficulty finishing. Not to mention the many times too much skin is taken off, which can make all erections for said dicks owner very painful.

And a choice, sure, for adults, who've lived with their foreskins and understand what they are losing, not babies or young children who're not at an age to understand what's being taken away.

As for the ear, not having an outer ear would make it easier to clean the ear canal, and for wax to drip out, so it would reduce canal infections. But we don;t do that, because it's better to just treat the few infections, than to remove someone's organs as a baby.