Agreed. When they say something like 90% of all new businesses fail, that doesn't mean you shouldn't start a new business, it just means a lot of stupid ill prepared people start businesses and fail. Which has absolutely no bearing on YOUR chances of success.
2. The problem here is that you can't train a bulldog to herd sheep. You can't train a poodle to be a livestock guardian.
Much of what working dogs do is pre-programmed. It's instinctive. Very little (if any) training is required.
Why try to train things to be things they were not already designed to be? It's FAR more efficient to breed the traits and instinct you want into a breed.
Why would your ISP allow you to send packets with a source address it hasn't allocated to YOU? That kind of check/enforcement is pretty cheap and simple.