plz do read this,, this is what i think..
its front is not much strong to save the passengers...
if the front is too strong then all the force would have gone to the passengers doing some serious damage...
note its cabin is safe, n when eva you hit car from back, the car in front recieves much less damage compared to back coz the front is sometimes still a bit in forward motion, on collision the rear car almost comes to halt n all stoping force is bourn by its body where as
the car in front converts most of the force from collision into forward motion thus getting less body damage....