Is castrating young boys ethical?

[Tea Earl Grey Hot]

What makes the medical side effects so special that my analogy fails?

Well. Remove your balls with a razorblade and after a period of 10 years tell me if the lack of sexual activity has caused any depression or other.

Coincidentely, The catholic church child abuse scandle surfaced in southern Germany some years ago because a boy was so violently abused by a priest that his testicles had to be amputated when he was 11.
The scandle came to public light when that person comitted suicide in his 40s due to the resulting depressions he had.

Can we really infer that his castration caused his suicide? Correlation does not imply causation, duh. He was sexually abused after all.

And I don't remember reading about the 10s of thousands of castrati killing themselves in the 18th century.

Unable to become tennis champ because you choose to study art = irreversible choice.

Nope. A human being is a learning animal and can always learn new traits, it might be capable to learn more as a child but the capability of learning itself never fades away.

I said world champ in my original example. Do you think you could ever possibly end up on ESPN if you started at 20?

But before the age of 18 these decisions will not be taken seriously by a child, neighter can a parent make such a grave decisions for a child.

But choosing to become an artist is a decision made seriously by kids? Or are we allowed to let kids make some non serious decisions?