That is true, but it also stipulates that while they remain military targets, that extreme measures must be taken to minimize civilian casualties.
So while you can still try to get the terrorists, you can't just bomb the entire thing, or fill the theatre with poison gas killing a ton of the civilians (as happened in Russia).
You mean like spending thousands of hours phoning people in the area and telling them to leave. You mean like sending your troops in at their own risk to escort civilians out of harm's way?
From my chair, it's proven very difficult to aid the civilians in the region when their own government is going out of their way to increase civilian risk. Well openly stating that the people living there are the problem of the UN. I don't know how to square that circle and I don't think anyone really does, which is ultimately a tragedy that we're seeing unfold. There's also the question of who's a civilian and who's not. We've seen video of medics taking weapons off of wounded people and handing them to people dressed in civilian clothes to fire on the IDF. That pretty much makes every male in the war zone a potential threat. Again, entirely understood by Hamas and part of their operating plan.