Your post is nearly indecipherable for a non-expert.
I don't really see a huge complexity issue here.
If you post some expert-level stuff about physics or microbiology or linguistics or early Medieval French poetry then most people won't understand it but nobody will complain because they're ashamed (well, at least slightly) of their ignorance on these subjects.
On the other hand if you post some expert-level stuff about guns or football or Justin Bieber then people will complain because they're proud of their ignorance on these subjects. Being an expert on those subjects marks you out as part of a group which some people here don't want to be seen as being part of, so folks are quite proud to proclaim their ignorance on these subjects.
Of course, go to another corner of the internet and it's all switched around.
I don't think your comment is true, either. I'd be very surprised if most people here were ashamed, even slightly, of their ignorance on any given 'nerd' subject. Very often, the top comments in a story are either explanations or requests for explanations followed by explanations, maybe followed by more requests for clarification. I also bet I can find more people here proud of their ignorance about say, Haskell monads, than about guns, judging by how loud they are about it.
Finally, Justin Bieber is a subject of a different nature--his prominence in culture is disproportionately higher than his importance, so people usually don't want to hear about it. Not a fair comparison.
In fact, I'd say that there are more of them, than hackers.
It is quite common for criminals in the UK to "re-bore" replica or deactivated weapons. It is also very common for these guns to backfire, killing the shooter.
The idea of gun hacking simply put me in mind of these sad occurrences.
I'm not suggesting anyone is a mouth breathing redneck, or an inept criminal for that matter, lets put it this way: when I think of some of the things I've hacked in the more conventional sense, I wouldn't feel safe if those things had been potentially lethal :)
EDIT: before anyone else brings this up, it has just occurred to me that the category of "potentially lethal" includes every object in existence, especially cars, which people love to hack and I would never anyone accuse of being reckless for hacking. So feel free to disregard my whole point.