barit1,
The sacrifice of turbine blades by interference with stator parts is a small price to pay in protecting the aircraft, even if it results in a lesser-energy uncontained failure.
I absolutely agree with your statement. It is a best design practice. You may not be able to prevent a disk that fractures due to a defect, but you can prevent a run away disk reaching a burst speed condition by the design and interactions of the surrounding airfoils.