Cory5412 said:

If you're not worried about pushdo/cutwail or poisoned DNS servers, but you are worried about air gap networks and rewritten firmware on your local peripherals, then I would be legitimately interested in hearing why.

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There's a difference between "not worried about" in the sense of "don't think it's a problem" and "not worried about" in the sense of "don't think it's something to get openly worked up about because nobody is under the illusion that it's a good thing in the first place." Poisoned DNS servers are definitely a potential problem and ought to be dealt with when they're discovered, to be sure, but nobody is going around promoting poisoned DNS servers as The Wave Of The Future, so there's no point in bothering about them beyond dealing with them when they are an issue.