We have mixed feelings. Although the angels didn’t sing Hallel when the Egyptians drowned, the Jewish people sang Shira. When G-d sticks up for His people we have to show Him that we appreciate it. We might shed a tear for those who are suffering, for those who may be a little innocent.
Rav Chaim Mintz:
The question was about the dancing itself, but I would like to know what Rabbi Mintz thinks about taking videos of such dancing and sharing it online, which I imagine raises other issues.