Volvo work on the same principle, their argument being that having only one fog-light illuminated removes any confusion between fog-lights and brake lights - a very silly argument, in my opinion. If you have 2 fog-lights and 3 brake lights, how camn there be confusion? Also, if you have i fog-light and the bulb fails, how many lights are working?
With my previous Volvo I bought a left-hand drive rear light cluster to solve the problem - not cheap but effective if it worries you.