" It isn’t a stretch to think his [Trump's] rhetoric may have resulted in the mass murder of Muslims in Quebec City. "

Actually, that is a stretch, or more precisely, a shortcut.  

Many of us are visually based learners, and the link between danger and visual clues is one such shortcut that hits the front of our minds instantly, regardless of our ethnicity or religion, all over the globe.  This is the root of racism, and it is hard-wired in virtually all of us.

Some of us, like the writer, have minds wired for ideological confrontation, and produce sentences like the one quoted above.  That response springs from the same type of mental shortcuts that produce racism, and it is apparently just as invisible to the ideologue as prejudice is to the racist.

But she's right. in the same way that Harvey Milk was right.  We need to get to know each other.  That's what re-routes our thought processes to override these shortcuts, and may produce a more tolerant world.