So you won't read the book because it's written by a conservative individual?
Conservatives are crazy and dangerous. There is quite a lot of psychological research done and published. Stanford did a study titled "Political Conservatism as Motivated Social Cognition".
A brief summary.....
"These things are strongly correlated
male sex
Conservative politics
adherence to right-wing ideology
homophobia
authoritarianism
cognitive rigidity
opposition to gender equality
traditional gender-role orientation
racism
variety of personal and interpersonal difficulties
intolerance to ambiguity
lack of intimacy in friendships with other men
misogyny
detesting femininity in men
exclusive masculine identity
greater rigidity and conflict in attempts to adhere to male gender norms
violence towards gays
arousal by gay male sex images
paranoia
chronic anxiety about personal achievement, competence, failure, and career and financial success
sexual coercion
hostility towards women
impaired intimacy
negative attitudes towards help seeking
low self-esteem
marital dissatisfaction
depression
authoritarian personality style
general psychological distress
psychotic thinking
obsessive-compulsive behavior
dogmatism
perception of threat by social change and instability
acceptance of relationships of domination between social groups
decreased cognitive complexity
higher need for order and structure"
When you look at the listed characteristics and observe Republican personality tendencies, you certainly see a strong correlation. I believe that conservatism is pretty closely associated with selfishism. I think the illness is selfishness and the manifestation is conservatism.