We got our son done because we didn't want to be faced with the situation of him asking us why he looked different to daddy. My DH said that he never saw any other little boys naked when he was a boy, but he saw his dad naked. So we thought it was better to make him the same as his dad, more odds on him seeing them naked.
But each to their own, I understand why people don't do it, my sister does her boys, my sister in law doesn't. I don't judge either way, I just do what is best for us.
Go with what you think is best for your family situation. Nobody elses opinion matters.