[MrB]

The purpose of “zero tolerance” policies is to allow officials to maintain positions of authority without ever having to exercise the responsibility that goes with it.

Can you tell that I agree with you?

[MosesKnows]

The purpose of “zero tolerance” policies is to allow officials to maintain positions of authority

You have explained the result but not the purpose.

The "purpose" is to ensure a continuing source of unconstitutional dollars from the Public Treasury. "Zero Tolerance" is an invention of the Federal Government to control state issues when the Constitution doesn't empower them to do so.