Donald Trump believes American Muslims are hiding something. “They know what’s going on. They know that [Omar Mateen] was bad,” he said after the Orlando massacre. “They have to cooperate with law enforcement and turn in the people who they know are bad. … But you know what? They didn’t turn them in. And you know what? We had death and destruction.”

This is a common idea in the United States. It’s also a lie. First, Muslims like me can’t see into the hearts of other worshipers. (Do you know the hidden depths of everyone in your community?) Second, he’s also wrong that we don’t speak up when we’re able.

I know this firsthand: I was the one who told the FBI about Omar Mateen.

I met Omar for the first time in 2006 at an iftar meal at my brother-in-law’s house. As the women, including his mother and sisters, chatted in the living room, I sat with the men on the patio and got to know him and his father. Omar broke his Ramadan fast with a protein shake. He was quiet — then and always — and let his dad do the talking.

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