Quoting Simon Hobson (linux@???):

> And the reason ISPs run recursive resolvers for their customers ?
> That's easy to answer. 99.99something percent of those customers are
> (in general) not technical people. So if the ISP supplies a
> pre-configured (or auto provisioning) router, which automatically uses
> the ISPs DNS resolvers....

Which then become the single biggest network security and network
performance problem many of those customers will ever see, because ISP
nameservers are typically dreadfully slow _and_ subject to pervasive cache
poisoning and other tragedy-of-the-commons problems. I rest my case.