How could a disengagement be done? Israel would inform the international community that it is abandoning all responsibility for Gaza residents and their welfare. The Israel-Gaza border would be completely sealed, and Gaza would have to obtain supplies and medical services via the Egyptian border, or by sea. A target date would be set for severing Gaza's water and electricity systems from those of Israel. The customs union with Israel would end, and the shekel would cease to be Gaza's legal tender. Let them print their own Palestinian currency, featuring portraits of Sheikh Ahmed Yassin.
Israel would also make it clear that it will exercise its right to self-defense by inspecting suspicious cargo on the high seas in order to thwart arms smuggling. That is also how the Western powers behave: They search cargo ships for nuclear weapons and missile components. And if we are shot at from Gaza, we will shoot back - with intent to cause harm. We have already proved that we can do so.
Read the whole thing, then find a way to tell our politicians that this is what needs to be done.