I would say it is strongly anti-tyranny. Official acts of a regime that are unjust are not laws and have no moral force. A lawful character may treat them as such. Additionally, the Rebel Alliance was not trying to sow anarchy (pro-chaos), it was trying to overthrow a tyrant's regime and restore the Republic.
Resistance to tyrants is obedience to God.
Yes, you can have a lawful rebellion.
But the rebellion in Star Wars looked to take power from a handful of people (really, one guy) that had it all and spread it amongst everyone (as the Senate).
That's very much "individual empowerment."
Chaos isn't limted to Anarchy as a political philosophy. Any government that supports EVERY INDIVIDUAL as having authority over SOCIETY is pretty Chaotic. Any government that supports ONE BEING as the maintainer over a GREATER SOCIETY is very Lawful.
The Empire had Palpatine orchestrating all of society -- they danced to his beat. He had power over masses of people. Lawful control.
The Rebellion wanted to put an end to that through terrorism and violence, to institute a government that gave the individuals power over it. The Senate was representative of people controlling government rather than government controlling people. Very Chaotic.
Of course, at this point, alignment is hugely open to interpretation, stretched basically to its breaking point, so all of this is IMO only.
From the Sith Code in Saga, it talks about "breaking the chains" of the universe and imposing your own will upon it. That's Chaos and Law in one sentence, right there!
I would say that's pretty Lawful.
Chaotic people reject the idea of chains. You break the chains and that is the point, you don't impose new chains because chains are wrong.
Lawful people can easily rebel against existing chains to impose new ones. Just because you're Lawful doesn't mean you can't overthrow authority, just that you value the idea of authority. You're not breaking the chains to free anyone but yourself (that's the evil part). You're *becoming* the chains, almost.