I'm saying they don't give him the ability to kill almost anywhere and get away with it. The Zoldycks, for example, are effectively bounty hunters. They don't kill unless they're hired to take out a bounty - or rather they aren't supposed to and aside from Illumi, who goes out of his way to cover his tracks, they generally don't.
Who do you think provides the Nen users? And there's a literal sequence in the show where a character attacks civilians and, despite being a Hunter, the Association sends people to hunt him.
Netero really doesn't care about anyone that doesn't entertain him, so there's that.