m3rons

They do not cry. Ever.

To give water to the dead is the most sacred honor that anyone could give but they rarely and never do that because it's ingrained in them to not waste water from birth. A single tear could mean life and death for them. To give water to the living? Unheard of.

Paul crying over killing Jamis in the book was a moment that astonished the fremen around him. Jessica ponders their reactions and knows that this is a holy moment.

Jessica then forcing Chani to cry for Paul(this was not in the book btw but I love it) is the ultimate betrayal of her autonomy. To force her to give what is essentially a piece of her life to him without her consent is sacrilegious and she knows it.