Good point. White Supremacists, Nazis, and the White Nationalist and Supremacist branch of the Alt Right (not all of the Alt Right is racist) support Trump, but not every Trump supporter supports the racist views of these groups. A similar point applies to Black LIves Matter-- there may be members or supporters of that group who have racist views of whites, but not every supporter of Black Lives Matter is racist (for that matter, you see a lot of whites in the Black Lives Matter parade). Also, judging from the comments from politicians, not only liberals are opposed to racism-- conservatives are as well.  The Nazi's, KKK, and numerous white supremacist groups at the parade-- including some who attend these parades just to beat up protestors (like the "White Fight Club") are groups that very few people in the country support but events like this get them a lot of media exposure.