So Sansa and Jon argued over what to do with the homes of the Umbers and Karstarks. Sansa claimed there was no penalty for treason and no reward for loyalty. I believe Jon was in the right by not punishing those kids for their fathers’ sins; however, that doesn’t mean the loyal should not be rewarded.
The boltons are dead. Gone. Extinct. That means the Dreadfort and Moat Cailin have no lords. Reward those loyal to house Stark the Dreadfort and Moat Cailin without taking the ancestral homes of innocent children! Problem solved! Everybody wins!