The harm is in exposing this toxic and racist rhetoric to my friends and family. This can be a) insulting and b) incite people we’re close to repeat and extend on this rhetoric. The further he is from the popular platform the less likely it is to happen to those close to me.

The popular platforms are full of dog whistles and memeified hate speech as people moderate them self in order to make the content more palatable for the general public and prevent being kicked of the platform. In an unmoderated dark corner of the internet that is not necessary. So arguable twitter is a terrible place for law enforcement to hunt down racists and prevent their terrorism.