The two points I've been making here are:
1. The traditional narrative that Israel fought a defensive war in 1967 is highly questionable, at best. It does not seem that the Egyptians were planning to attack, the Israelis themselves had a major hand in the escalation leading up to the war, and the Israeli military was extremely confident that it would quickly defeat the Arabs (an assessment that the Americans shared) and wanted a war.
2. This narrative that Israel gained the West Bank and Gaza through a defensive war is then used to justify Israel's more than half-century military rule over the Palestinians. Even if the Israeli narrative were 100% correct, it would not justify imposing military rule over millions of people for decades, while slowly robbing those people of their land and subjecting them to regular violence and humiliation.
The only thing I wish to add is that this kind of “selectiveness” of facts by those who argue with Israel existence is by itself one of the main reasons for Israel creation in the first place.