Not to mention the fact that vehicle front bumpers and crumple zones are DESIGNED to do just what yours did. The rear of vehicles are designed the opposite way as they have to remain rigid.

I had something similar happen years ago in an older car I had. Someone rear-ended me and I got out and there wasn't even a broken tail light lens on my car and the front of the other car was mashed in badly. This could not have been at more than 10 or 15 mph.

Just the way things are.