The concept of connecting to earth has been misunderstood for many years and the misconceptions have been past down generation after generation.
Even the code was used to lead these misconceptions.
Read the Fine Print Note from the 1984 code cycle
The equipment grounding conductor does just as its name implies. It connects the non-current carrying metal parts to earth.
The Main Bonding Jumper installed in the service equipment bonds these conductors that are used to connect non-current carrying metal parts to earth to the grounded conductor of the service entrance conductors. Solidly grounded was accomplished with the main bonding conductor but the language was interpreted to mean that it meant connected to the grounding electrode system due to the verbiage above the last sentence. This is what makes the breakers trip and the fuses blow in the event of a ground fault.