The source of this chazal seems to be Bava Kamma 60a, which talks about Mitzrayim and Makas Bichoros, and that was non-Jew to Jew.
So now we have mikoros for both Jew to Jew AND Non-Jew to Jew.
Yet you stated rhetorically in your OP “Why should yidden lose so much during hurricanes Sandy and Irene?” and continue to defend that despite “Kivan SheNitan”.
Are you now going to say they were not yet technically Jews in Mitzrayim so they count as non-Jews, instead? “Kivan sheNitan” actually means, according to the gemara, that the tzaddikim are affected first. So this means that non-Jewish Tzaddikim are affected first? Not likely…
Even if that were so, we would still have mikoros for both Jew to Jew AND Non-Jew to Non-Jew.
But, regardless, why would there be any difference?
I think the burden of proof is on you to show that this Chazal is not a plausible source for Sandy’s destruction, unlike your OP.