David Cameron would like to treat non violent extremists (aka truthers or conspiracy theorists) as terriorists.
http://www.independent.co.uk/news/uk/politics/david-cameron-extremism-speech-read-the-transcript-in-full-10401948.html
http://www.globalresearch.ca/british-pm-david-cameron-non-violent-extremists-including-911-truthers-and-conspiracy-theorists-are-just-as-dangerous-as-isil-terrorists/5405059