http://en.wikipedia.org/wiki/Games_Peop ... %28book%29
I think transactional (adult, parent, child-roles) explains a lot of what's going on.
First, we should acknowledge that most people are functionally illiterate when it comes to scientific understanding of a specialized topic. Of course being uninformed doesn't prevent people from having an opinion anyway. Many/most will even freely admit to not knowing much of anything about X but because "they're smart in other areas of their life" or "have common sense" they'll proceed to make a decision anyway without blinking an eye. Yup!
The implication/demonstration is that the science/scientific argument itself carries no weight at all. It's like handing a written message to a 3 year old. They can see that it's a piece of paper with words on it, but they have no way of understanding those words and the message they carry(*). In transactional terms, this means it's mostly impossible to have adult-to-adult transactions.
So here's what happens ... I'll give a climate science example but it could just as easily be a GMO food example.
First person: (Putting on adult-mode) This is what the science says and (switching into parent mode) this is why the government must regulate your emission behavior.
Second person, who doesn't like government regulation (right-wing): (Switches into child-mode) No, your science is wrong!
Second person, who does like govregs (left-wing): (Switches into parent-mode) Yes, we must regulate to protect the "children".
This is how the climate science policy (and health care) has traditionally been framed. However, consider this instead ...
First person: (Putting on adult-mode) This is what the science says and (switching into parent mode) and this is why we must deregulate nuclear and wind power production to let the free market solve the problem.
Second person, who doesn't like deregulation (left-wing): (Switches into child-mode) No, your science is wrong!
Second person, who likes dereg (right-wing): (Switches into parent-mode) Yes, we must deregulate non-fossil fuels to protect the "children".
We would have had a very very different debate if deregulation had been emphasized instead. In that case, we'd have lefties decrying "the science" and righties believing that they were smarter and more rational, etc. GMO food safety is a good example of this one.
Since the great majority are scientifically illiterate, it means that almost conversions turn into parent-child interactions. It becomes a matter of politics. This is why for these subject areas, political orientation is a much stronger predictor of whether a person agrees with the "adults" than education (college degrees, etc.). Because scientifically, almost everybody is woefully uneducated.
It's further complicated by the fact that the scientists themselves have had their parent and child behavior trained out of their scientific discourse (not necessarily other aspects of their life). The scientific method is specifically intended to remove those destructive impulses in order to make the science objective. Hence, they don't really know how to convey scientific information to someone taking on the subjective child-role or the subjective parent-role BEFORE that person attempts to take on the adult-role. Taking on the adult-role is highly unlikely because it require substantial effort to gain literacy. It's a rare thing.
(*) This also means that anyone else is free to make up a different note and claim that it, the science, says the opposite. When people are illiterate, words or science is simply a prop in the play or interaction.