Originally Posted by AdrianM

The arms are designed to run into the bulkheads during side hits and stop before they move far enough to bend or break a screw.

As you said the fronts get glancing blows and the alloy screws function as a fuse to prevent chassis damage.

If someone's front screws are breaking easy chances are they are over tightening them and introducing stress cracks. Make them snug, they wont loosen and they will take a substantial hit before breaking.