Final answer:
Ezra and Nehemiah dealt with the issue of restoring Jewish law and rebuilding Jerusalem, whilst countering polytheism and opposition post-Babylonian Captivity.
Step-by-step explanation:
The bad issue that Ezra and Nehemiah deal with in the biblical context involves the restoration of Jewish law and the rebuilding of Jerusalem after the Babylonian Captivity. Their narratives are focused on re-establishing the worship of Yahweh exclusively, countering the backsliding into polytheism and practices that deviated from the laws of Moses.
Amidst the rebuilding, they also had to confront the social struggles and opposition from surrounding peoples that challenged the revival of the Jewish community and its covenant with God.