If explicit trust is required I agree, but in the DNS case we already
have a singly-rooted tree that everyone relies upon. if you want to
use the word "trust" then we all trust the root for DNS, but I think
the term is not applicable here.
I think the word "trust" accurately reflects the situation.
People do trust the current DNS to some degree. The danger of a DNS-based
PKI is that people will invest far more trust in the DNS PKI than is
warranted, and/or that the root and/or TLD servers will abuse that trust.
Recent history demonstrates that such abuse is likely.
Keith