I mean, look at what Kree have been made out to be:
In Guardians 1, they were terrorists.
In Agents of SHIELD Season 2, they tried to turn everyone into super heroes to make an army.
In Agents of SHIELD Season 3, they had created the leader of the army to be a nearly indefeatable monster.
In Agents of SHIELD Season 5, they revived and plotted so that Earth would be destroyed, they take over the rest, practically enslave everyone and make them kill each other to keep them in line, fed off of their work, and sold Inhumans as he only valuable form of human.
For them to make the Kree sudden protagonists, there will be some convincing that will need to be done. Especially since they seem to view themselves so highly above humanity, and that only their lives matter.