In a very limited, raw policy sense, it would have made sense for Israel to try to force a population transfer out of the West Bank, and particularly the highlands ringing Jerusalem, in the aftermath of '67. That having been said, it would have been disastrous, in that same narrow policy sense, for Israel to have attempted any sort of mass killing of the Palestinians in the same time period, because of Israel's dependence on Western (first French, then American) arms.