One of the main functions of tradition is to pass down to successive generations a comprehension of the meanings of the customary and traditional praxes and language. If the Tradition fails at that, then the praxes become meaningless and stupid, and are soon discarded as extraneities worthily subject to Ockham’s Razor: to the first principle of order, which is deletion. That’s when you get iconoclasm, whether intentional or not.
Intentional iconoclasm knows the meanings of the icons it destroys. Unintentional iconoclasm does not. The former is effected by destruction; the latter by desuetude.
Once the meanings of the cultural praxes are gone, the praxes themselves soon follow; for, there is then no longer any reason for them, that anyone knows or remembers. And that’s when the culture decoheres.