The authors fail to note that, as in the 1930's, right wing hate groups are lavishly funded, and have the most sophisticated (i.e., expensive) propaganda campaigns.
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There are industry actors who fund these groups.
There are foreign governments that fund these groups.
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The point is to instill fear - at the base of Maslow's hierarchy - to stampede public opinion to trade liberty for authoritarianism.
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What would be humorous, were it not so dangerous, is when the proxies of one group get upset when they are up-staged by the proxies of another group, as in the 2016 US GOP primaries and presidential election.
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A remarkable coincidences (not) is that for all the right wing groups, terrorists, racists, nationalists, religious fundamentalists, and so on, in however many countries, all have this in common, without exception: 
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All of them are opposed to any kind of collective action to address climate change.
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Makes it fairly easy to figure out where most of the money is coming from.