I'm not a doctor. If the adenoid removal was medically necessary, I'd probably go along with it. But "just in case" easily turns into "where does it stop?" Why don't we remove all the spare parts at birth, and get it over with? Why not an appendectomy at birth, to prevent appendicitis? And let's do a lap band, to prevent childhood obesity. And get rid of that gall bladder, since all it does is get messed up later in life anyway. The list goes on and on.
Going the other direction, there's nothing separating male from female circumcision. There is no evidence whatsoever that the original intent of circumcision was not to reduce sexual pleasure, and I can easily see an argument that this was exactly the intent (suborning baser desires in favor of serving God, a persistent theme throughout the Bible). That ancillary benefits have been discovered by modern medicine several thousand years later is completely irrelevant. Those demanding the right to circumcise their boys should logically be in favor of any parent who wants to circumcise their girls.
I'm personally in favor of a rule that says, if it ain't broke, don't remove it. Our parts exist for a reason. For children, leave them be, unless they are creating a clear and present danger to life or health. If an adult wants to electively start whacking bits off of themselves, by all means have at it. Satisfy your amputational fetish on your own body, and allow kids to have the same choice when they're of age.
