properly articulated white nationalism is an actual threat to the stability of globohomo, unlike piecemeal islamist sperg outs. they're laser focused on preventing the former from emerging until they can drown them out with mass immigration, whereas the latter is a relatively banal mid-level security concern. this is why the fbi is constantly trumpeting that "white nationalism is the greatest terrorist threat" despite the fact that actual wn terrorist attacks are exceedingly rare - they're aware that the slumbering beast could actually overthrow them if they don't obsessively suppress it
United States