The supermarket down the road doesn't benefit me, because I don't use it. It benefits a bunch of anti-social people who live in the area. Ergo cashiers are anti-social people's accomplices.
And since when did the Zoners agree to hand people over to privateers? Corsair law would surely dictate that the privateers are murderers themselves. So shouldn't the Zoners hand privateers over to Corsairs, in that case? Your argument about Switzerland is moot, since Zoners don't have to abide by some sort of Sirius-wide law. There isn't one.