Slavery in the U.S. is commonly used as an example. “Of course,” a good modern citizen will say, “slavery was wrong even when it was legal.” The passing of the 13 amendment did not make slavery morally wrong; it was wrong already, and the legal structures finally caught up to the moral structures.
Edit: > Have you even thought about how that would work?
I have. I would materially improve the conditions of the civilian Palestinians. With a granting of rights, an influx of aid and reparations and an overall increase in their standard of living, it would make the existence of Hamas undesirable. Hamas only exist because of the oppression of Israel. Take that away and the need for Hamas will dwindle. Violence begets violence.