"Bring Down the Empire."
From the perspective of The Darkstars and probably many others The GUARDIANS of OA (which non-colonized peoples don't call them "of the universe) and by extension the Green Lantern Corps.
They're just practicing what amounts to basic "American Imperialism". They literally send a "The most powerful weapon in the universe" (that they have control) of to your world... normally before you have any superhuman representation
and say to burgeoning planets "Aliens are Real. These are the rules"
Every Darkstar is made aware of that straight out, that they and "MOST" of the universe is under the purview of an army of intergalactic conquerors. Now they aren't told that the Controllers wanted that job for themselves and lost.
They're told that green lanterns are the police arm of a totalitarian overstate. And in many perspectives they're Frankly not wrong. All you have to do is point out how "Sinestro was set loose on his people"; "Hal Jordan?" mass murderer; they oppress societies natural rulers and promote their own puppet dictators. They interceded conflicts they're not wanted or needed in: Rann/Thangar war.
Such control they have that they can and have placed embargoes and quarantines on whole star sectors and several times entire galaxies.
Your very earth is colonized by multiple members of these self appointed, "Liberators"... "Space Police" ... but they have arrived her with the intent to bring you world under they OAN sway.
Your goal is simple become a hero to your people. Speak Truth to power in your every action. Be an ambassador to your earth. Become an Icon for your world
Show them that there's something greater that kneeling to distant masters with uncaring eyes. Many fear the power of distant light, you?
You shall be our Dark Star.
Hand the suit to seemingly random black kid the summer after high school. We buff the suit. It has VAST reserves of intergalactic knowledge so he does what any good guy would do.
Starts using it to help people. Like seriously help people.
Dude starts turning the WORST city in the country into a paradise. Like Detroit City wakanda. First thing he does is purify the water and treats it with something that makes people more resistant to Diabetes and High Blood Pressure, curing them of the addiction to salt and sugar.
What gets him noticed by the heroes is when he teaches people how to get their homes off the power grid, and how the local metas have started following him.
This pisses off the cops.... this pisses off the establishment... this agitates those power interests and the heroes greatly. *but the first people that interrupt are hired meta-goons.
The Goal of the controllers is that they know how crucial earth is in the grand scheme of things. They NEED a representative there. Don't get me wrong they're doing it on OTHER worlds too, but the deal is they're choosing good hearted
Idealists to make changes to the world and expose the hypocrisy of whoever is ruling everything.