Reagan was adept at using the "dog whistle" to bring in the voters who felt uncomfortable with racial equality and this represented a large swath of the voting South and pulled thousands of other voters from other non-southern states.  Trump is following this playbook.  Just because a very tiny minority declare themselves Nazi's and actually go out to protest does not mean millions more Americans are not listening and heeding this dog whistling.  Just look at some of the comments on these boards.