I think people have truly forgotten how much we owe to purebred dogs.
Some people need dogs. Not as pets, but as working dogs. Their lives and the safety of the public depend on it. They don't do this because they have to, or enjoy it....they do it so that you and your children can go about your day safely and with comfort. Mixed breeds are great, but even many purebreds, bred and trained specifically for that task, cannot measure up to the high demands of such serious work.....
K9s aside, what about all the other life saving careers purebreds excel at?
Mixed breeds are great, and are often better at alot of things then purbreds, but there is no consistancy. I would rather put my life in the hands of a dog who has inherent traits that make it suitable for the work.
I guess that is just my opinion.