I proudly served in the IDF and would do so again in a flash. Only those who do not consider Jews human would claim that we kill children willy-nilly.
We do however know all too well what happens to our children when we cannot defend ourselves.
Hamas wants dead Palestinian children. This gets them sympathy, money, and avoids them having to govern, allow for freedom of the press, elections, protest and basic needs of their people. We also know that their orders come from their primary backers Iran. You know the Holocaust Denying/Holocaust promising Iran that stones women to death, hangs gay people from cranes and helps the butcher Assad of Syria murder over 500,000 of his own people. Right on Israels Northern border.
Hamas starves their people and then pays them to go to the border fence with Israel for violent protests. Hamas pays them if they are injured, or pays their families if they are killed. Hamas uses the crowds of civilians to throw IDEs, bombs etc at Israelis and to try to infiltrate into Israel.
What do you think would happen if thousands of Gazans flooded into Israeli communities on the other side of the border?They would all go shopping?
Note by the way, there are never any such protests at their border with Egypt.