system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU/Marvel] What exactly are the cultural and religious differences that make the Nova and Kree societies hate each other?
gpt
The Kree live for military conquest and value violence, to the point that they despise their medical workers as an unavoidable necessity.  In contrast, the Xandarians who founded the Nova Corps live for peace and knowledge, to the point that they created the greatest library/computer the known universe has ever known: the Worldmind.

The Kree measure their worth as a people by the success at conquest;  in contrast, the Xandarians have been the victims of numerous attempts at conquest, in particular those attempts by Zorr of Luphmor and later by the Skrull Empire.   Eventually, the planet along with its culture was destroyed in the Annihilation War.

The Kree put together all their greatest intelligences into the Supreme Intelligence for the express purpose of increasing their effectiveness at conquest.   In contrast, the Xandarians put together all their greatest intelligences into the Worldmind both from a love of knowledge and from a desire to protect the rest of the galaxy from conquest through the Nova Corps.

The Kree prize brutality and a joyless hierarchy in which the stronger rule the weaker and individuality matters for nothing since all individual worth is derived from one's place within the (military) hierarchy.   In contrast, the Xandarians and therefore the Nova Corps prize thoughtfulness, cleverness, insight, and compassion for others, and despite the need for order in a policing organizations such as the Nova Corps, they still respect and cherish individuality rather than the Kree notion of ownership by the state.

They are almost exist as mirror opposites of one another.