First of all, "breaking the bones" seems to give patients an image of some sort of club or baseball-bat-like device used by surgeons to break the nasal bones. Far from this, we use small, sharp tools called osteotomes (like a tiny chisel, often with a lip or "guard" to keep it in exact position) to make slits in the eggshell-thin nasal bones, which allows surgeons to "infracture" or narrow these bones.
This narrowing is done for excessively wide upper nasal structures, or to restore the normal nasal pyramid after removal of a prominent hump.
Nasal osteotomies are not needed when the nose has a normal width in the upper third, or no hump to reduce. If a hump is reduced without concomitant osteotomies, an "open-roof" deformity is created, and this will require re-operation to "fix."
"Breaking the bones" during rhinoplasty is necessary in most cases to give the refinement that patients ask for, and although some bruising is inevitable when this is done, "avoiding" the nasal osteotomies in cases where it should have been done is NOT a plus, it is a high (or guaranteed) risk of needing re-operation. Bruising resolves, but bad rhinoplasties require revision!
Web reference: http://www.mpsmn.com/html/nose-surgery.html