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Is there some way to say "ignore DNS results from this provider", such that were you to spot an issue you could block that provider's information (and anyone replicating their version of the truth) and thus find a valid path. If that were possible you wouldn't be reliant on a third party to resolve the issue to get your system working, and once your system worked, you could contact them to resolve the issues for all.

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If someone is giving out bad DNS records, you can just choose to use a different DNS server.

But in this case the problem was bad routes. You can certainly force your own routers to use fixed routes instead, but that doesn't help you unless everybody else along the path also does it. So it's not easy. There are tricks one can play -- like advertising your network as a set of smaller, more-specific networks (since routers will usually favor more-specific routes over more general ones).

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