I agree with you that most of the public reaction can be understood as expressing the dignitary understanding of the castle metaphor. In fact, I think that’s probably the more natural way to understand the significance of the home for most people. I’m interested, though, in the disconnect between that fact and the content of the legislative responses to Kelo, which do not simply target home ownership or even individual property ownership. In other words, the castle metahpor seems to make it matter what kind of property we’re talking about and who owns it, but the legislative responses protect all private property. (In this respect, the Institute for Justice is an easy target though by no means the only offender. I really don’t have it out for them, it’s just that they’re “Castle Coalition” worked so well with the paper’s focus.)
As for your point about the connection between protecting property ownership and the role of mediating institutions, I think it’s an important one and well taken. As with everything related to property, though, I think the answer is a very complicated one. Certainly some zone of autonomy is necessary for property to serve as a seedbed for mediating institutions. So, on the one hand, too few property rights will undermine property’s mediating function. On the other hand, too many property rights can easily lead property-related power to inhibit normative diversity, as happens, I think, when property ownership becomes too concentrated. Not enough property regulation and redistribution and you get the latter scenario. Too much and you get the former. I think this lines up very nicely with Catholic Social Teaching, which emphasizes both the importance of property ownership and the dangers of making property an end in itself.