“Every hateful thought or deed matters—not just because of the direct harm it causes to others, but because of the indirect role it plays as a vector for the spread of hate. Horrific attacks such as the one that took place at the Tree of Life synagogue don't just happen out of nowhere. They happen because over time, biased thinking and disrespectful behavior become normalized, leading larger numbers of people to demonize, dehumanize, and diminish the outsider.”