Major monuments, or religious items, are usually considered as protected items. This is because both sides in the war have agreed to protect these items.
The primary method of protecting the civilian population, is by enforcing a strict rule of wearing a military uniform. When every single person in the military (on both sides) in is uniform, it is easy to protect innocent civilians.
When thugs and criminals violate the basic "Gentleman's Agreement", then they have forfeited those implied protections.
True, but this war has more than just the military dimension to it. It's not justified but even as we speak our "good friends" at Aljazeera are busy as beavers spreading this film across the world.