This breakdown isn’t included in the poll results as released (and I don’t have access to The Wall Street Journal story) but according to John Harwood only 24% of Republicans, 27% of non-college white men, and 37% of rural residents are worried “that the United States will experience another mass shooting or attack by white nationalists, targeting people based on their color or country of origin”.
What’s unclear from these numbers is whether 76% of Republicans, 73% of non-college white men, and 63% of rural residents aren’t worried about it because they don’t think it will happen, they don’t care if it happens, or they want it to happen. For the sake of everyone’s safety, I’d sort of like to know that answer.