I don't really understand your agitation here to my comment. Yes, right now liberals aren't open to new ideas and conservatives are, but traditionally (and its well documented) liberals are open to new ideas and experiences but conservatives aren't. This doesn't mean anything other than what it says there.
The liberal-urban nexus and conservative-rural nexus is defined by their circumstances. You can choose to not keep a gun while living in the rural area, but you definitely have trouble keeping a gun in the urban area.
If you live in the rural area you can have many-many kids without an extra pressure on resources or you may choose to have fewer kids, whereas in the urban areas you need to be a lot more rich to have that 3rd kid because the resource pressure is so great.