You realize that power lines come down ALL THE TIME, right? If a car accident takes out a utility pole, everyone has to go dark? A tree limb breaks and knocks a wire down, businesses on the other side of town have to lose power?
These examples are instances of a single downed line. In this case, the power company likely could get to the scene immediately and stop the risk of electrocution.
In the Shawnee example, the power company was supposedly so busy with calls from all over the county, they were unable to get to this line in a reasonable amount of time. THIS is the example where "pulling the big plug" would be prudent, not a case of a single power line that could be under supervision very quickly.
The power company was clearly overwhelmed.