Idk. What is the plan? Because killing kids doesn't seem like a good plan to me. Hamas doesn't give a shit about the kids. So how does it hurt them to take the kids out?
So you have no plan other than for Israel to sit and take it and have their people killed. Israel's responsibility is to it's people and to stop hamas from killing more Israelis. This is an active war zone, so people are getting hurt on both sides. The plan is to kill enough hamas soldiers to end the war and get back the hostages. I'm not sure why you seem to think that Israel's plan is to kill kids.
I guarantee that if Mexico was firing rockets into the US from a large Mexican City, our military would take out any part of that city where rockets were being shot from.