The academic consensus is pretty much in agreement with you, not sure why you got downvoted. Polynesian migrations tended to happen after a decrease in carryin

The academic consensus is pretty much in agreement with you, not sure why you got downvoted. Polynesian migrations tended to happen after a decrease in carrying capacity of settled islands that led to civil war over limited resources. I can, if really needed to dredge up papers to back this, but I'm not making any promises for when.