From what I've gathered, there's some overlap with the idea of personal sovereignty and growing one's own food. There's also the anti-government or anti-regulation position, where the oversight of the meat industry is associated with additives and hormones.
There may also be a natural repulsion from the vegan crowd, who tend to be more progressive and pro-government.
It is strange to me that there is more outspoken climate-denialism than environmental conservativism in the community. I've seen more links to chemtrails than deforestation, for example.
Of course, like everything, sometimes it's just that we encounter a handful of very outspoken individuals who don't represent the larger group at all, but we assume as much because they are "louder".