It is defaulted to "auto" because more and more of the internet _IS_
enabling DNSSEC: all delegations from the root are signed, and most
registries will take care of getting the DS RRsets into the parent zone.

The only way to actually fix some of the DNS cache poisoning attacks is
to enable DNSSEC.  That the upstream forwarder doesn't support dnssec is
a configuration bug in the upstream forwarder.  I'm disinclined to make
the default be less secure, in order to "support" broken upstream
forwarders.  But I'll stop short of marking it Won't Fix, at least for
now.

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https://bugs.launchpad.net/bugs/1500683

Title:
  By default DNSSEC is enabled with automatic keys

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