@Brandon9000,
The idea that the husband should get into a fight with 15 people, but bring a stun gun and mace is completely insane. No one in real life wants to do something like this. Visiting the local DEA office because the neighbor doesn't have a job, but has many visitors is also a completely unrealistic idea.
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You first stated that legally taping in public might or likely would bring on an assault of 15 people and yet you think that being arm is insane!
Sorry you can not have it both ways if they are not doing anything illegal then there would be no need or desire to attack someone taping now would there be?
An assault would prove that they are both up to illegal acts and would give anyone the right to used force to protect themselves. A 15 to one or two attack could even be of a nature of that a reasonable person would be in fear of great bodily harm or lost of life and therefore allow deadly force in reply.
So if they are peaceful and not up to illegal acts they might feel it is strange and amusing that someone is taping them but that would hardly be something that would start an assault.
And there is no way on this earth or any other earth that I would allow a drug house to be set up next door to me.