If one believes that things of value ought to be distributed according to a rule which has nothing to do with merit, nothing to do with labor but according to a vision which says that each shall receive according to his need and each shall produce according to his ability, the idea of any individual exerting dominion over property becomes anathema. That rule of distribution cannot function so long as the principle of property lives.
Not incidentally, the people who despise the concept of property also despise the concept of the nation state and therefore seek always to undermine one of the classic definitions of a nationstate, the ability to establish frontiers and to exercise dominion within those frontiers. If the left despises the idea of disparate nations and further despises the idea of frontiers defining those nations, certainly it disapproves of fences the marking and protecting those frontiers. Thus we have the application on a macro level of the desire to do away with fences protecting property on the micro level.
Without fences there is no property and there are no frontiers, without frontiers no nation states; with unrestrained immigration, the disintegration is hastened.
