What things are bad in Islam?

[Darwinian]

This is obviously some strange usage of the word 'Adult' that I've previously been unaware of

Islamically you become an Adult when you hit puberty and are mentally old enough.
Aisha(RA) had her own house at the age of 9 so she was mentally old enough.
And she had undergone puberty.

A person in the 7th century being classified as an adult is a different age than being classified by most 21st century governments where it ranges from 16-18

So in Islam, if a man wanted to have his way with a 9 year old child, all he would have to do is make sure that she has started puberty and buy her a house of some sort and there you go, she's suddenly an adult?

Really?