Here's what we know about the Kree so far in the MCU:
From Guardians of the Galaxy, we've got Ronan, a warrior who's the villain because he upholds the ancient traditions of his people, and sees their recent peace treaty with Xandar as a betrayal of these principles and traditions. While he never specifically enumerates what these traditions are, his actions in pursuit of upholding them show his intentions to be genocidal in nature, and the Kree empire, despite their peace treaty, specifically refuses to do anything to stop him, nor even to offer a token official condemnation of his actions.
From Agents of SHIELD, we see that the Kree have a long history of meddling in human development, creating the Inhumans to be used as super-powered soldier slaves. Every time we've seen them they are practically universally portrayed as ruthless and cruel with no regard for the rights or well-being of others. (Season 5 in particular focuses heavily on their status as horrific monsters!)
But now we're getting trailers for Captain Marvel, in which she describes the Kree as noble, valiant protectors of the cosmos. This is set in the 90s, almost certainly before the peace treaty that ended their brutal, (likely) genocidal war against the Xandarians, which was a new thing 20 years later.
How are we to reconcile these two exceptionally opposed takes on the Kree and the morality of their culture?