The shooter appears to have left a note. The authorities have not shared the contents of that note which makes be believe the shooter was a lefty or a muslim.
If the note indicated he was a right winger it would be public by now.
True!
If it were an ‘alt-right’ note, it would have been made public 30 minutes after the perp was found dead.
When they don’t know the motive = Islam or Antifa.