I think dogmatic, inflexible application of the Prime Directive is stupid and wrong, so saying the Prime Directive applies doesn't change anything for me. That makes it sound like you're saying non-interference is always the right course simply because the Prime Directive says so.
Also, I don't
consider "Dear Doctor" to be a well-made episode. I don't find it thought-provoking - I find it insensitive, ethically dubious, and badly written. I'm not condemning it for "making us think." I'm condemning it for being, in my opinion, a stupid episode.
But if you enjoy it, I'm not going to condemn you
for it. Like any work of fiction, it's subject to a variety of interpretations.