Remnant of what?
We rejoiced over the egyptians suffering because they oppressed us, and every day in the morning prayers we recite the song that the Jews spontaneously sang in praise of Hashem for drowning the egyptians and saving us just as its lyrics are written in the Torah.
Yes, that was permitted, but there is a lot written that says we should not rejoice over our enemies downfall.. Even the angels protested when we sang at the shore of the Yam Suf.
I have quoted this, from Pirkie avos, before... It was written by the Sage who added the curse to the Amidah against the heretics...
http://www.torah.org/learning/pirkei-avos/ch4-24.htmlWhat We Think about Sinners
Chapter 4, Mishna 24
By Rabbi Dovid Rosenfeld"Shmuel (Sh-moo-ail) the Small said, 'At your enemy's fall do not rejoice, and when he stumbles let your heart not be joyous, lest the L-rd see and be displeased and turn back His anger from him [to you]' (Proverbs 24:17-18)."This week's mishna tells us that we must not gloat over the downfall of our enemy, even if such a downfall was eminently deserved. When G-d metes out justice to the wicked, we should find it unsettling. G-d's power has been unleashed in this world; am I so deserving that it will not be directed at me?
The commentator Rabbeinu Yonah adds that there *is* a certain sense of elation we may feel. G-d's honor has been restored. Wickedness does not last forever. G-d ultimately sees to it that His enemies are punished. If He does so in this world, just a small amount of His glory has been revealed to mankind. And for that, we may rejoice.
We should not, however, rejoice over the suffering itself our enemy endures. It may be necessary and it may be 100% *right*, but it is not a source of joy. The Talmud states that when the Egyptians were drowning in the sea, the angels wanted to sing their daily song of praise to G-d, and G-d quieted them: "The creations of My hands are drowning in the sea, and you are singing song?!" (Megillah 10b). One of the most wicked and immoral nations history has produced was at last experiencing its well-deserved fate, yet G-d Himself, so to speak, experienced no pleasure in the process.
Yet at the same time the angels were silenced, Moses and Miriam led the Jewish nation in our most glorious Song of the Sea. Were we so much better? If the angels could not sing, how could we?
The answer is that we sang not as a form of gloating over our enemies, but because we had witnessed G-d's salvation. And it was more than just a salvation. We caught a glimpse -- albeit a fleeting one -- of G-d's Divine guiding Hand. In a moment of inspiration, we were able to grasp the Big Picture -- to discern G-d's slow but directed guiding Hand throughout our history. Everything had come to a head. Jewish history had unfolded before our eyes. We realized that far beyond our puny comprehension G-d had been orchestrating events all along. Hundreds of years of exile and suffering had been purposeful and a part of G-d's master plan. We recognized that G-d had been purifying us in the crucible of Egypt, slowly molding us into His nation, and preparing us for this grand and glorious moment when we would see our Creator face to face.
Singing because people, even wicked people, are drowning we could never do. Singing because G-d had revealed Himself to His nation and to the world -- such a song would reverberate throughout all the generations.