$30,000 Overnight AdWords Bill

This story of a single, unemployed mum/mom who set up a test campaign on Google AdWords only to find a $30,000 bill the following morning has been doing the rounds of late.

Should Google simply wipe the slate as a beginner’s mistake? Or should she be made to pay? Why should ignorance over rule accountability? If I test drove a Ferrari having never driven a car before, and crashed it, surely I would be held accountable?