Highland Clearances were complex but get retold as: "rich people stole land from poor people" often.This is where I think we need to treat history differently from current events, because concepts like ownership, title, rights and such are ultimately subjective outside an agreed legal context. Obviously, there is disagreement here.
I don't know much about that period, but there are countless examples of similar things.
The system of land ownership was at one point, tribal (clannish). tribes controled lands and chiefs control tribes, rights to the land negotiated custom and familial means. Chiefs became lords. Tribesmen, tenants. Titles, privelages and customs changed.
Eventually, the lords became modern peope, industrial era capitalists. Economies became monetary. Clans ceased to exist. Titles became wealth. Tenants became squatters.
I think it's hard to follow the history, while maintaining a modern sense of property.
I can certainly see how people view the scottish peasant class as having a moral claim to the property.