The covenant between Jehovah and Israel is one reason why Babylon must fall; and Babylon's own guilt is another. Hence pity is out of place.
"Here liveth piety where pity ends;
Can any man be guilty more than he
Whose bias with the doom of God contends?"
(Dante, 'Inferno,' 20.28, Cayley.)
Flee, therefore, lest ye be involved in Babylon's ruin. For Jehovah's purpose of vengeance cannot be reversed.