SOLUTION: Report them for hate speech, promotion of violence, and anything else harmful.
The asshole said it was shock value and such to steer from the knowledge of it being intended to spread hatred. It’s like training your pet to salute Hitler and other racist rhetoric, and when caught, citing it as a joke. It’s not a joke to incite violence. Doing so needs to be done carefully, and with an outcome that sees only the volatile being harmed, shunned, and/or outcasted.