Q: the deaths of innocent Egyptian children who had no say in the Jews enslavement?
A: During the seder, we take a moment and list each of the ten plagues. For each plague listed, it is customary to dip your pinky in a glass of wine and put it on your plate. After the final plague (death of the firstborn) participants are forbidden from licking the wine off their finger because Jews should not revel in the taste of death. We mourn the deaths of the firstborn, but remember that the pharaoh was always warned about what would happen. He chose to ignore the threats of G-d and suffered the consequences.