Kids do stupid stuff like shoplift a chocolate bar or buy weed and booze. When you hack into corporations and defraud people out of $100,000's, that's not 'kids doing stupid stuff'. That's a person acting with sophisticated intent and working knowledge of the consequences of their actions.
Deserve all the punishment they get. And the idiot employees of Twitter who provided user credentials/access (you can't just telnet in - you'd need VPN credentials, server credentials, database credentials etc.) should all be fired.
If this 17 year old 'kid' committed 1st degree murder, somehow I don't think you'd be so quick to dismiss it as kids doing stupid stuff. Not comparing the crimes, but the intent and knowledge of the consequences were all in place.
This isn't due to a lack of maturity.