She was mature at the time of consummation and married with consent so why do think it's wrong? Women in hotter climates attain puberty earlier.
WTF is wrong with you? How can a 9-year old kid attain "maturity" to engage in sexual relationships? I expected you to counter his argument by saying that there is no evidence to prove that she was 9-year old at the time of marriage. Disappointing.
I suggest you read Aisha's journals and narrations. She always praised and followed Prophet's teachings throughout her life till she died at the age of 64.
If she never mentioned a single issue with her marriage throughout her life and was most happily married then I don't see what's the problem with you.
She was 9. Even children that are being captured by ISIS now, upon release, in some cases side with them as they have been indoctrinated. It's called Stockholm Syndrome.
What choice did this girl have but to serve and follow. It was all she knew. Besides that, had she spoken out if she had an issue what would have been the consequence? That is a serious question, what would her fate have been if she'd just decided she wanted out? Was that even an option and what would have befallen her if she had chosen that route?