It is an open air prison and people have limited ability to move anywhere. These civilians were gathered in this house because they were told to by the IDF. They wrongly assumed they were safe because the IDF knew they were civilians. For the IDF, it was like shooting fish in a barrel. The fact that so many here refuse to believe even their own soldiers shows how much in denial they are.
Education Minister Bennett orders increased funding for gay youth organizations (Haaretz)
from the article: What led to IDF bombing house full of civilians during Gaza war?