We are deeply disturbed, but not at all surprised, to learn that those who attacked the Islamic Center of San Diego were reportedly motivated by anti-Muslim hate. Hate against American Muslims is completely out of control. Numerous politicians have spent the past year claiming that all ‘mainstream Muslims’ should be destroyed, that American mosques and elementary schools should be shut down, and that American Muslims should be expelled from our nation. Just last week, House Republicans held a congressional hearing to fan the flames of hate against American Muslims, their houses of worship and even Muslim school children. Time and time again, we have seen that hate speech like this can lead to hate crimes. The mass shooters who massacred families at the Christchurch mosques in New Zealand and worshipers at a mosque in Quebec all embraced the rhetoric of prominent anti-Muslim extremists. A deadly attack on an American mosque was as predictable as it is unacceptable. Anti-Muslim hatred is one of the last acceptable forms of bigotry in American society, and it is long past time for the tolerance of this hate to end.