Why use a safety factor when anchoring tents?

To account for certain uncertainties that occur in design, manufacture, installation and use of tents or structures of all kinds, safety factors (1.5 to 2.0) must be used.  There is always a chance that the loads imposed on a tent stake (or tent anchor) will exceed its ability to resist that load.  Tent installers must always plan for high winds, heavy rain, and the beer guy that unties a rope and reties it with the wrong tension, poor soil conditions and adverse weather conditions.