"just causes" clearly depends on what side of the fence one stands...
However, you are correct, there is NO just cause for terrorism... EVER!
I'm not sure that there is a "quest for more territory", rather, a quest to reclaim occupied territory... On that basis then one can consider there being 'freedom fighters' or, perhaps a 'resistance movement'...
So, we agree that a "freedom fighter" who uses terrorism is nothing but a terrorist, then? Since terrorism is never acceptable there is no point in cleaning up the language we use. A terrorist committing terror attacks for a "just cause" is still a terrorist.
Sure, if you want to call it a RE-acquisition of territory, rather than the acquisition of territory, it makes little enough difference. (Though, of course, BOTH sides can justify using that terminology and we both know that, technically, Arab Muslim Palestinians never had any territory under their own self-rule). Still, for the Palestinians it is fundamentally about the acquisition of territory.
For Hamas -- it is the (re)acquisition of the entire remaining portion of the Mandate for Palestine. It is the belief that Arab Muslims should have sovereignty over 100% of the territory and the Jewish people should have sovereignty over none. They are not fighting for "freedom" or "resisting foreign rule". They have freedom, complete control over the territory they have. Freedom enough to use the resources available to them for purposes they choose. They are not under foreign rule. They rule Gaza. They don't even have a small Jewish influence there as Gaza has been deliberately made Judenrein. So, no, they are neither "freedom fighter" nor a "resistance movement" -- they are fighters demanding more territory and denying any sort of territory or self-determination for the other group for whom this place is a homeland.
For the PA -- it is the (re)acquisition of the territory to the 1967 lines, without compromise or exchanges or negotiations. And it requires this land, also, to be the Judenrein. And it requires the (re)acquisition of territory within Israel by the returnees. The PA, also has control over its own territory (Areas A and B). So no, neither "freedom fighters" nor a "resistance movement", but a drive to gain more territory.
The control that Israel has, especially over the West Bank/Judea & Samaria, is that of security. The only need Israel has in that territory is to ensure the safety of Israeli citizens and to ensure the sovereignty of Israel (on some territory).
But what is Israel fighting for? Israel is fighting an ideological and a physical war to defend itself, its citizens and its sovereignty. Israel isn't fighting for territory. Israel is fighting for its right to exist.
What I don't get about you, is why you occasionally insist that you support the rights of both peoples, yet continually support or argue for only the one side. Why do you support the acquisition of more territory by the Palestinists? Why aren't you arguing for a secure Israel?