1) Well, at least I got the robber back, and that what matters to me. A shame about the others. Sucks to be them I guess.
/sigh... we were doing so well there, and then you lapsed back into terrorism.
2) A little quick googling does seem to indicate that there is such thing as subjective threat. As well as objective threat. You have a very strong opinion about what a threat is, but that doesn't make it true.
It's simple, really. Only an objective threat matters. Because you "feel" threatened doesn't matter one whit, if you're not actually threatened. If you are actually threatened, you are being aggressed against, whether you "feel" threatened or not.
3) It's not my fault that people are afraid of a little fissionable material in my pocket. Why do you get to decide what a threat is. I see what I think is a gang member in a dark alley reaching for his gun, I'm not allowed to draw faster and shoot? I have to wait until he points his weapon at my head before I can shoot?
So what you're saying is that I can't defend my family, not until the park shooter kills one or more of them? Which is a bit late imho. I see where your system is consistent, it's just a dumb system. I have to wait until he does irreversable damage.
I could care less about the fissionable material. It's the fact that the bomb is primed to explode that is the problem. You are more than welcome to draw first and shoot - always remembering that if it turns out he was reaching for his keys to get into his apartment, you may well find yourself in some hot water.
And no, I am not saying you cannot "defend" your family, but that if you choose to stop him from firing by instead shooting him, you are going to need to be responsible for your actions. I notice that you have not mentioned the one course of action which would handily stop a shooter just out for some target practice - as he has informed everyone of - from shooting until your family is clear: Stepping in front of the rifle. That would cause any responsible shooter to immediately safe his weapon, if not completely put it down. Are you afraid to take risks with your own safety to ensure that of your family's?
4) Again, your opinion. They're safe from my bomb until it goes off and I'm safe from their guns until they shoot me. See, everybodys safe. Why do get to decide what a threat is? Just repeating "because I say so" doesn't really convince you know.
Again, only an objective threat matters. And an armed nuclear bomb is an objective threat to all within the range of the device. A holstered weapon is not an objective threat to anyone, much less someone who has a nuke wired to his vitals.
5) How? The trade will obviously be done via a few more or less respectable individuals, many will disappear after the transaction, cash is good for making people forget. It took the US how many years to find OBL? Biggest army/intelligence network in the world? But I'm sure a few good men working on their spare time could do it faster. Unless they had to keep to the "non agression principle" and not coerce people to tell them what they want to know.
What makes you think it would be on their spare time? If there is a bounty, there will be bounty hunters. And I have already explained that (and why) I believe such trades would be significantly rarer in an AnCap society, and we're powerless to stop them now, regardless, so we're pissing into a fan here anyway.