I find it shocking an officer didnt know the microchipping regualtions. No excuse, and I will apologise on his behalf. With regard to dog problems, I suggest your first port of call is community officers.
There are officers who are trained in the recognition of banned breeds. I admit I'm rubbish at that - i see loads of crosses about that look to me like they have pitbull in them!
I feel sorry for the breeds. It isn't their fault.
There are lots of both twatty dog owners and non-owners and I've experienced my own dog-racism (?? Apologies I just can't think of another word) with people actually picking up their dogs when they've caught sight of mine.
Personally, I don't believe all dogs have the makings of what I consider suitable pets, because of their breeding. That's not to say they are dangerous per se, but I cannot see how someone can think that when a dog's grandparents were still pulling down bears etc., they'd make a good pet.
Unfortunately it often tends to be a certain type of person who wants these dogs. For safety, a status symbol, the fact that they are banned, whatever.
For what it's worth though, I have met a few banned breeds who were lovely, but they had responsible owners who'd registered them etc.
I'm a firm believer in putting the onus on the owner, not the breed.