That's a classic handwave to avoid going into the fundamental merit of the problem: which is that, based on claims that were last valid more than 1000 years before, a fundamentally-theological apartheid state was installed and then supported with brutal force, pursuing a slow but methodical ethnic cleansing of the land. Unlike similar efforts in previous centuries (i.e. the purge of Native Americans, Aboriginal Australians, or pre-Colombian South Americans), the Israeli effort doesn't even have the excuse of philosophical immaturity of the mainstream: it was pursued well after the post-colonial fundamentals had already been established between WWI and WWII. These are hard facts, no matter how you spin who started what in which year.
The sad thing is, there is now, realistically, no way out of the current situation that involves reconciliation - that chance was missed in the last century. The animosity is now likely unsurmountable, the military disparity is entrenched for good, and a sustainable resolution can only involve the complete purge of Gaza and West Bank. Israeli citizens have chosen to belong to another nationalistic ethnostate, right when the Western mainstream started to move towards more modern and inclusive models of statehood - ironically, on the example of Israel's best ally. As such, they are busy repeating all the sins such states have been guilty of during less enlightened ages.