[Issaquahking]

Being ground, and circuit completion, are two different animals...

[Lonesome in Massachussets]

Normally a hazard exists when “stray voltage” can find a path to ground through the body of the victim. Yes, if you grasp two leads of an ungrounded transformer, woe be unto to you, but that's not what generally happens. More commonly, the chassis of a piece of equipment comes into contact with an energized conductor. If the chassis is ungrounded and conductive, then if a victim touches (or pees on) the chassis while grounded, by say, standing barefooted on a grounded access cover, a circuit can be completed. It the lamppost was grounded, then the access cover and lamppost would be at the same potential and no circuit across a potential would be completed.

[Lonesome in Massachussets]

PS: That was the reason why Thomas Edison was an advocate of grounding all electrical equipment.