The Punishment For Machlokes Does Not Differentiate Between People

Rashi says that this teaches us the severity of machlokes. An earthly bais din will not punish a child and the Heavenly bais din doesn’t punish someone less than 20, but here we see that even infants were punished as a result of the machlokes.

Sefer Likutei Yehuda writes that his grandfather, the Imrei Emes zy’a, said in the name of the Sefas Emes zy’a, that this explains the words we recite in the Hagadah: ‘It was not one stood against us to destroy us but in every generations they stand against us to destroy us.’ He explains that our enemies is ‘not one’. When we are not united, we are in danger of being destroyed.