But, c'mcon...there is a small bit of logic to this. If your front wheels , which do the steering, don't get any traction, you can have all of the drive wheel grip you want but the car still won't go where you want it to. Your rear end will slide right around. Been there, done that.
A buddy of mine even took his RWD truck in for tires and they put the best tires on the front for THAT very reason.
Geeze you guys, he probably has one on the right rear tire so he can GO and STEER. Tire chains come 2 to a package and any idiot knows you don't put both chains on the same side of the car - you would be out of balance because your center of mass would be biased to that side of the car. His momma didn't raise no fool.