I agree with you completely except for this pair of lines:
I felt like much of fremen culture is not possible for the human psyche to handle. I don't think that grief and resentment can be bottled up so easily without consequence.
... because there was, in fact, a massive consequence to the Fremen's bottled-up grief and resentment: they went on a genocidal, galaxy-spanning jihad before being driven extinct by their supposed white saviors.
