When has Star Trek ever been about "exploring the unknown?" This is one of the most persistent myths about Star Trek, and mystifying because it's easily countered just by watching a movie or episode and thinking about the plot.
Here's how the episodes go:
Enterprise crew scans a nebula (exploring the unknown) for about five seconds at the beginning just to remind the audience that these people have boring day jobs. Then the Klingons attack. Or someone gets a virus that makes them wacky. Or someone has a personal crisis.
The conflict in the episode is never about "exploring the unknown," it's always about some antagonist causing a problem, whether the antagonist is humanoid, virus, or personal demons. Sometimes exploration bumps them up against this antagonist, and sometimes there are other reasons, but the antagonist is the necessary part of the formula and the exploration is not.