It sounds to me like they were, in fact, civilized and responsible nullsec residents. As you yourself indicate: they live there. You do not. You were an unknown quantity entering their home, and they took steps to ensure they and their neighbors were safe.
You were the ‘barbarian invader’ in that scenario. Aria gives a brief explanation, but I just want to highlight something… because as she rightly points out, the behavior you seem to be seeking—the behavior CONCORD etc all tolerate and enforce in high-sec—is NRDS.
Now, to expand on Aria’s point, this is exactly why NRDS space is more dangerous than NBSI space. NBSI allows the local populations to maintain some level of security: Anyone not white-listed (blue-listed, I suppose) is treated as hostile. This, in turn, minimizes how effective actual small-scale hostile action can be.
NRDS means the local authorities… can’t take action against anyone until they have proven themselves to be a threat. This usually involves several repeat offenses, as people claim things were accidental, or they didn’t understand, or any number of nonsense excuses. And because the entire reason groups adopt NRDS is to be welcoming, those excuses are usually given the benefit of the doubt the first two or three times.
This is also why most experienced null pilots feel less safe in highsec than they do in enemy nullsec: in NBSI space, you know who the friendlies are. So you know who the hostiles are: everybody else.
In NRDS space (including highsec) you don’t. You know who some of the hostiles are. You might even know who some of the friendlies are. But nobody is stopping the hostiles from putting together a crew you don’t recognize and coming and blowing you up just for the giggles. And so that happens, a lot, every day in highsec. That’s all ganking is, after all: NRDS in action. (NRDS inaction, too.)
CONCORD retaliation is not prevention… especially when CONCORD, unlike even the most corrupt NRDS admins in nullsec, never permanently blacklists… redlists?.. repeat offenders. At most, you go and get a friend to buy you some pirate tags in jita, turn them in to CONCORD, and they forgive your offenses so you can go back to ganking.
So congratulations. You’ve been complaining about civilized people looking out for their neighbors. Don’t want to get blown up? Find out who actually runs those constellations, and open up a dialog with their government officials about travel permits… or, in capsulese… talk to their diplos about blue standings.