Possible meanings are 1) the brokenness represents the problems the people have as a result of their sin. Alternate translation: "They act as though my people's problems are not serious" or 2) the brokenness represents the people's sin. See how you translated this in [Jeremiah 6:14](../06/14.md). Alternate translation: "They act as though my people's sins are not serious" (See: [[rc://en/ta/man/jit/figs-metaphor]])
Here "lightly" represents treating the wounds as if they were not serious, as if it were easy to heal them. (See: [[rc://en/ta/man/jit/figs-metaphor]])