Also it is a matter of ownership and its justification. Part of the implied bargin is the responsibility over the land to be its steward in /some/ sense. Ownership isn't unconditional and society would rather have someone making some use of it than an irresponsible owner who leaves it useless and only comes back to stop those from making it useful.
If their abdication was forced by the claimanint said claims the absense is far more justified but that gets into other concepts like damages and the fact they never intended to let it lapse but were forced to.
If their abdication was forced by the claimanint said claims the absense is far more justified but that gets into other concepts like damages and the fact they never intended to let it lapse but were forced to.