I agree 100%, material conditions are the initial cause, but that outside the affected area that simply causes disaffection - terrorist propaganda directs that disaffection towards killing civilians. Given that far right radicals are created by the material conditions of late capitalism and misdirected towards hating minorities by propaganda, the only thing we can really do about that (aside from trying to change those conditions, which we should already be doing) is to try to avoid them being contacted by fascists looking to utilise their anger.