Air traffic control dates back to the $1920$s$,$ when radio introduced communication between pilots and ground controllers. Through the $1960$s$,$ much of the air traffic control system that is still in place today was being implemented, including control towers and dedicated air traffic controllers. For the past decade, air traffic control systems have been partially automated. The supplemental automation serves to assist human air traffic controllers monitoring the air space and provide the pertinent guidelines to avoid collisions. However, there were still over $2,000$ human air traffic control errors in $2012,$ even with the partially automated systems.

The author brings up the fact that there were still over $2,000$ air traffic control errors in order to make which of the following points?