Well I have a cousin with Aspergers syndrome and he does behave very oddly at times. Aspergers tend to fixate on subjects. My cousin is into film, ask him anything...even about some obscure bollywood film from the early 1900's and he'll tell you who directed it, who starred in it, what other films they did, that their grandson now works as an animator for TheSimpsons etc.
It appears that if this Brendan Campbell does have Aspergers, he may have fixated upon the law/gardaí etc. Before my cousin had intensive behavioural therapy he had severe problems with basically letting his mouth get him into trouble
He also used to refuse to answer to his name, instead only answering when he was called "Dr. Manlington"
Perhaps Brendan Campbell responds only to the name Brendan and sees his father and not him as Mr. Campbell.
A few people in other threads in this forum are claiming it may be fake because the voice is so repetitive and monotone in nature. To be honest, when I was first listening to it I thought about my cousin and his Aspergers Syndrome. I'm not saying that the tape is not a fake but my first thoughts were not of a fake.
It's a disgrace to be honest. If the Gardaí are well used to him calling, they will be aware of whether or not he has Aspergers. If he does have Aspergers, they would know and if that's the case then they should be sacked. To deliberately goad someone who through no fault of their own behaves differently to the "norm" in society is wrong. They wouldnn't dream of teasing a Downs syndrome man like that and would get the sack for it so the same should happen here.
EDIT: mareid marie I just saw your post! I can second the auditory distraction. My cousin, who is now 21 can't stand pubs or clubs that play music. It drives him batty! It appears as though he senses sound differently to others, although I don't know anything much about that aspect.