Who is behind them? Um… Conservatives. All of them.
Conservatism is hate. Nearly every act of domestic terrorism in North American history has been committed by conservatives. Nearly every act of racism, bigotry, misogyny, transphobia, homophobia, xenophobia and anti-semitism ever committed in our planet’s history has been committed by conservatives.
Teach your children why it is inappropriate to make friends with, keep relationships with or do business with conservatives. Marginalize hate by marginalizing the hate group.