I mean, if the IDF started shooting from UN facilities, and dressing in clothes which'd make them indistinguishable from civilians, you can guess exactly what would happen.
Fighting war criminals is hard. But considering the numbers, the IDF are pretty darn good at it By comparison to the rest of the world.
Every member? Nah. But you can bet relative to most of the world's armies, they're really good.
Also maybe if so many people keep telling you that the condition Hamas created are horrible and it's mostly their fault... Maybe listen?