If they are shooting at you, they become dead Hamas. Anyone unarmed is a civilian, even if they are Hamas. Everyone there is likely Hamas.
Any "civilians" still in the north are Hamas. That makes target identification so much easier.
Eight-year-old girls can still carry small boxes of ammunition for their older brothers to use. They can also pull a trigger to detonate IED's. That makes them legitimate targets of war. Our guys saw children used as combatants in Iraq. The Israelis will see this in Gaza. It leaves an indelible mark.
Some true horrors of war have yet to be displayed for us. And we are not prepared for them.