^Right, it's certainly his interpretation...but there doesn't seem to be any suggestion that it's one beyond his legal authority to make. Again, in "A Private Little War"—even years
before the Klingons became involved—young Lieutenant Kirk's survey of Neural had to provide a
recommendation as to whether the culture was developing normally and thus should not be interfered with. But, of course, we can interpret
this as basically being a certification that the culture hasn't
already been interfered with
by someone else. And maybe it's the fact that the
Archon's prior visit to Beta III clearly
has become significant to their culture, to some extent, that is considered sufficient justification for making the case of the door being already "open" to further interference.
I do rather like the idea that (at this time at least) the
directive is exactly that, an overall
guiding principle or
philosophy, enforced by a standing general order with respect to Starfleet, but not necessarily an ironclad
law.
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MMoM