1)
Why does it say "Ach"?
1.
Radak: It is consolation. Even though you will be exiled, you will not die via the sword.
2)
Why will he not die via the sword?
1.
Malbim: The punishments were due to the sins of the generation; also he suffered due to their sin. (He was a Tzadik.) We do not eulogize one whom the king kills. (Tzidkiyah deserved to be eulogized.)
