And manufacturers are installing LED rear lights precisely for this reason - the standard tungsten filament bulbs are not capable of lasting and usually fail due to vibration (motorcycles are prone to this as are some cars). If I remember correctly it's due to the potential of a liability law suite.
Only by expecting more and pushing manufacturers do we get better cars. (point for debate!)
I agree that a piece of glass 8" off the floor isn't likely to last a lifetime and we can't expect them to be bullet proof - nobody is surprised that the windscreen breaks when it is hit by a small stone at speeds in excess of 30mph or are they?
Both my fogs were fitted by my dealer - one floats reasonably freely in its mount, the other does not. So far I have been 'lucky' but then I haven't had one smashed on my other vehicles either! Could it be how I drive?
The people that have had theirs smashed - is your bonnet chipped as well?