The point I was trying to make is that the most extreme content (i.e. literal terrorist manifestos) typically is _not_ full of racial slurs or similar content.

The point I was trying to make is that the most extreme content (i.e. literal terrorist manifestos) typically is _not_ full of racial slurs or similar content. Look at the manifesto from the Christchurch shooter, for example. Not a single racial slur. In fact, it's entirely possible that, as a place becomes more serious/more political (and thus perhaps more dangerous and indeed "extremist") you will see the speech use fewer slurs or offensive speech. Thus if you wanted to detect actual extremism you'll have to do much more in-depth analysis to try and infer meaning. Probably with human analysts rather than a script counting the number of n-words in a given week.