If someone started a GoFundMe campaign, stating that he would use the donations to buy an AR 15 so he could shoot people at Kroger, and if you gave him a few dollars and he eventually killed people with a gun purchased from those funds, would you be a murder? Legally, probably not, but you would be abetting a murderer.

Anyone of any race who supports Donald Trump is abetting a person who espouses racist philosophies (whether Trump or the supporter believes them or not), and Trump's racist political policies have harmed many different racial or ethnic or religious groups.