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If they are worried, they should worry about BGP.

The DNS roots are probably not the biggest risk due to their nature (discussed in the post).

BGP needs a complete overhaul. Every once and a while all the internet traffic "accidentally" gets routed to china due to a "technical mistake"

mhmm. Blacklist them.

You'd need to blacklist a lot of the internet. BGP hijackings, accidental and probably not-so-accidental, have happened all over the place.