1)
Who says that they tried to cure Bavel?
1.
Radak: Strangers who were in Bavel.
2.
Malbim: The ones who wanted to help it.
2)
What is the meaning of "Naga El ha'Shamayim Mishpatah"?
1.
Rashi: Its punishment is tall, until Shamayim.
2.
Malbim: Its fall was due to its star and Mazal in Shamayim (the Ma'arachah), and also from Hashem's Hashgachah, which is attributed to Sechakim, which are above Shamayim.