lairdwilcox
I just found this interesting account of extremism. Several years ago I compiled and published a large collection of quotations on this subject along with several related topics. These are available as free downloadable files. Here is the source:
The Writer's Rights
Over 1,600 Selected Quotations on Freedom of Expression, Civil Liberties and Individual Rights Compiled by Laird Wilcox. 136 pp. ISBN 0-9761337-4-1.
http://www.overalltech.net/pub/Quotes5Writer_sRights.pdf
Propaganda, Persuasion & Deception
Over 1,125 Selected Quotations for the Ideological Skeptic Compiled by Laird Wilcox. 124 pp. ISBN 0-9761337-0-9. 2005.
http://www.overalltech.net/pub/Quotations-Propaganda.pdf
Rationality, Rhetoric, Skepticism & Logic
Over 835 Selected Quotations for the Ideological Skeptic Compiled by Laird Wilcox.
80 pp. ISBN 0-9761337-3-3. 2005.
http://www.overalltech.net/pub/Quotations-Rationality.pdf
Fanaticism, Dogmatism & Ideological Thinking
Over 1,050 Selected Quotations for the Ideological Skeptic. Compiled by Laird Wilcox. 95 pp. ISBN 0-9761337-1-7. 2005.
http://www.overalltech.net/pub/Quotations-Fanaticism.pdf
Political & Social Psychology & Behavior
Over 1,250 Selected Quotations for the Ideological Skeptic. Compiled by Laird Wilcox. 121 pp. ISBN 0-9761337-2-5. 2005.
http://www.overalltech.net/pub/Quotations-PoliticalPsych.pdf
The Writer's Rights
Over 1,600 Selected Quotations on Freedom of Expression, Civil Liberties and Individual Rights Compiled by Laird Wilcox. 136 pp. ISBN 0-9761337-4-1.
http://www.overalltech.net/pub/Quotes5Writer_sRights.pdf
Propaganda, Persuasion & Deception
Over 1,125 Selected Quotations for the Ideological Skeptic Compiled by Laird Wilcox. 124 pp. ISBN 0-9761337-0-9. 2005.
http://www.overalltech.net/pub/Quotations-Propaganda.pdf
Rationality, Rhetoric, Skepticism & Logic
Over 835 Selected Quotations for the Ideological Skeptic Compiled by Laird Wilcox.
80 pp. ISBN 0-9761337-3-3. 2005.
http://www.overalltech.net/pub/Quotations-Rationality.pdf
Fanaticism, Dogmatism & Ideological Thinking
Over 1,050 Selected Quotations for the Ideological Skeptic. Compiled by Laird Wilcox. 95 pp. ISBN 0-9761337-1-7. 2005.
http://www.overalltech.net/pub/Quotations-Fanaticism.pdf
Political & Social Psychology & Behavior
Over 1,250 Selected Quotations for the Ideological Skeptic. Compiled by Laird Wilcox. 121 pp. ISBN 0-9761337-2-5. 2005.
http://www.overalltech.net/pub/Quotations-PoliticalPsych.pdf