In honesty I have no idea about the Haitian part, but Vietnam is still too different. While guerrilla warfare work, it mainly worked against a force that was extremely distant and had many other disadvantages.
It is almost impossible for Palestinians to win using guerrilla warfare. They are too close to Israel and Israel have full control of the airspace and water. Such strict control on Palestine makes this type of resistance futile.
Israel is definitely way too powerful for such tactics. Palestine do not have what is necessary to break hold enough to continue a fight like this.
See above.
See South Africa.
Also, you dismiss the comparison on the basis of the international component, but that ignores that a large part (though by no means all) of Israel's ability to engage in this conflict on the level they do is because of international support. What the rest of the world thinks does matter.