Are men such as Crusius and Tarrant anti-immigrant racists? Yes, I’m sure they are. But they have also become infected with another form of extremism that very few people want to talk about, and that is environmentalist extremism: anti-capitalist, anti-industrial, anti-consumerist and anti-corporate.

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I value the principles which became the hallmarks of Western democracy, made possible by the Age of Reason; religious tolerance (a wall between religion and state), a commitment to scientific inquiry,...