5. "People who are the most deeply committed to an idea or policy are the most critical of it."
It is true that people who are immersed in and committed to a certain field have a better idea of the drawbacks. In general however, it is not true that such people are also the most critical of it as can be seen in many contexts.
To begin with, people who are deeply committed to an idea or policy might also have know of the pitfalls and problems in it. For example it would take a physicist to see the pitfalls in string theory and be its informed critic. On the other hand, a cowboy would find it hard to know where to start on the subject. It took Joseph Stieglitz, the critical ex-head of the world bank to discern and elucidate the problems in the World Bank, not someone in the communist world opposed to it merely by ideology. Sometimes it requires a person with a microscope to see the germs.
While that is true in some instances, for the most part however, people who are deeply committed to an idea or policy usually have good reason to have done so in the first place. This in turn rules out that they would be the most critical of the ideas themselves. For instance, it would be hard to find an astronaut who would be critical of funding space and scientific research. On the other hand it is quite the norm that people who are far removed from science and technology are its most vocal critics. Most people are averse to the idea of biting the hand that feeds it.
Further, people committed to an idea or a policy are usually deeply entrenched in it, just by virtue of being committed to it. This very fact may preclude them from seeing the world from outside their limited ken. It is common for scientists in one discipline to see the world through those lens, and the same is true for political ideologies. Being 'capitalist' maybe criticized in some islamic and socialist countries, while being 'communist' maybe critized in countries that are democratic. Wearing a burka is critized in the West and wearing a bikini in the Islamic world.
Lastly, people who are committed to an idea or policy have more to lose by being critical of it than those that are not. A music record company is more likely to be critical of the internet medium than a company that has provided its music through the internet since its inception. Monetary and commercial interests may preclude them from being evenhanded critics of an idea or policy.
In summary, while it is true in a few cases that a person's knowledge of an issue can make them more aware of the limitations and in turn make them better critics, like a dog exercising the decision to wag its tail, it is more often than not that reasons relating to money, career and survival, can make people less likely to be critical of the ideas they are committed to. More like the tail wagging the dog.
