The exact question I was answering was "Why shouldn't land owners be able to build whatever they want on their own property?" I imagine he must be a hardcore libertarian because there are a bunch of them here and that is the question he asked and not some other one about mixed zoning.

Oh I see. Yes, he did say that further up, and I think your reply to that was correct. However when he got specific in his next comment and talked about dense metro areas, I don't think your reply was valid, and that's what I've been responding to.

I think, given the context, that what I said is equally true of dense metro areas and suburban neighborhoods that happen to be near shale gas.