What are they supposed to do? A group wants to eliminate people of your religion. They are blocking these civilians from leaving as they continue to try to kill your fellow people.
What are they supposed to do?
The same site you cite also says it's appalling that Israel said, "get out of the area." Put on the critical thinking hat for a second.
There are terrorist who are killing Jews embedded in an area. Israel says we have to deal with this, leave the area. But, it's appalling for a nation to defend its own people and before they do they tell civilians in the area, "you need to leave."