system
Given the following post, respond as if you're commenting on Reddit:
human
[StarWars] Why do we fight?

I'm a pilot with the Rebel Alliance. I lost my parents when Alderaan was destroyed. That is what brought me over to their side. 

But why were we fighting the Empire before that? So what if they killed a bunch of Jedi, those wizards wielded far more power than they had a right to. Much more than the other 99% of us.
gpt
Why do you fight? Why indeed!

Friends, the Galactic Empire means you no harm! We seek only to bring peace and order, and without the so called 'rebellion' - in reality little more than a band of loosely-organised criminals seeking to better their lot at *your* expense - those goals would have been fully met long ago.  
Think back to the dark days of our fathers; the time of the Old Republic. A corrupt, bloated organisation, with the noxious Senate as the embodiment of all that is wrong with such a system of government. How much more has been achieved since the dissolution of the Republic and the establishment of the Empire!  
As you rightly say, the Jedi wielded too much power without a moderating body. With the Emperor at the head of us all, we can be sure that no such situation can arise again - any power-hungry wizard resurgence would be swiftly dealt with... if there were any possibility of such a thing happening! As you well know, the Jedi are extinct, and thanks to the Emperor, we are all that much safer.

Brothers! Sisters! *Friends!* Lay down your weapons and come to us! If fighting is your skill, then you can fight - the Stormtrooper legions are ever-expanding, and we have the finest pilot training facilities in the galaxy! If engineering is where you are best, then work as an Imperial Engineer - we are working on a number of engineering programmes, the like of which has never before been seen! It pains me, as it pains our Emperor, to see so many walking in darkness, misguidedly believing the lies and propaganda spread by the traitor criminals of the 'alliance'.

Join us. For your own sakes, and for the sake of the galaxy - a galaxy where your children can grow up, safe and secure, in the arms of the Empire.