As far as I can tell, completing the Galatia quest line by doing a mission for Kanta will result in you royally *** them off. There also does not seem to be a way to get them to calm down and it is therefore impossible to offer tribute to the pirate lord and reduce the impact of hostile activity.
Ok, so Alex said that this only happens if you space the clone without a helmet. Still, its permenant and I don't like that there is nothing the player can do about it.
I would recommend we make a little demonstration for the pirate lord by blowing up that pretty little star base of theirs. (To make it clear that this is something the player should try, contacting Kanta directly should have something to the effect of "What are you gonna do, blow up this starbase?" tacked onto the end.)
Upon defeating their starbase, you get taken to a dialog with Kanta where they are totally not begging you to stop and would be completely willing to put any past... misunderstandings to rest. Accepting this generous offer removes Kanta's Wrath from Hostile Activity and allows you to even try and pay tribute like normal.
You can also refuse and let lose one final volley into the station's now exposed reactor core. This has the effect of flat out destroying Kanta's Station. (You don't get any rep penalties for this, everyone wants Kanta dead). From the debris you get Kanta's Mangled Head, which can be given to any major faction for an immediate rep boost and a nice chunk of flavor text, as well a bounty or boon which varies from faction to faction. You also get a bonus -8 "killed Kanta" progress modifier on hostile activity.