I totally agree. Look at an egg. Put it un your hand and squeez it as hard as you can...does it break? No
same thing as the inner fenders. they are there for the the vehicle to be structurly sound. The only reason a car would not start folding, if you took out the inner fenders, is if you put in frame conectors...but even then, I would suspect that the car wouldn't be 100% true around where the k member/firewall would be.