I hacked a friend's brother's Paypal and spent $700 on WOW professional leveling when I was 13
Why did you hack your brother's friend account?
I tried to hack my own brother's account, but I wasn't good enough
It's wrong to hack into others' accounts.  Not only are you stealing their money, but you are committing a federal crime, and could be arrested for it.
I say who should be arrested.
The police and the law say who should be arrested. Virtual theft is still theft and you'll be caught eventually. You wouldn't want others stealing from you, so maybe give it a second thought the next time you hack someone else's account.