GM Recall, Stop driving it

Being a business owner I always wonder what happened leading up to this - did they catch some rogue employee purposely not welding something? Did they get a bad batch of welding "glue?" How did they first learn of the problem? Maybe a truck just fell apart as it rolled off the assembly line?

And the brand bashers really make me laugh - a disgruntled employee could pee in the milkshake machine at McDonalds just as easy as Burger King.