I, not a messenger. The Torah relates that after crossing the sea, and seeing Pharaoh's army dead in the water, the former slaves rejoice, singing and dancing God's praises. If the heavenly hosts had rejoiced during the tenth plague, surely God's rebuke would have been even stronger. Consider how we remember the plagues during the Seder. As we read each one, we spill some of our wine.
Sweet wine represents joy.
It's a powerful reminder. We recite the plagues with a dark repetitive chant that invokes fear. It helps us feel some small part of the horror that the Egyptians experienced during the plagues. When we finish chanting, we should be aghast, as though we had just seen their suffering with our own eyes. But the Jewish attitude against capital punishment does not end with ominous chanting and ritual spilling of wine.