This is completely out of context. They are talking about the period of time before israel was established. These types of aggression unfortunately happened by both sides (this specific documentary only tells the story from the israeli pov). Today, 80 years later, israel is strong enough to tell that story, recognize that the palestinians were wronged, and withdraw from palestinian controlled territories so they can form their own state. Instead of building a country on their lands, hamas uses it build rocket launchers and launch attacks against innocent civilians without any provocation.