Warning: This video contains graphic content As the man bobbed in the water, onlookers pulled out their smartphones. “Go on, go back where you came from,”one man yelled. “Africa!” shouted another.

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“He is stupid. He wants to die,” said a third, caught on film. Someone in a nearby water bus threw out a life vest, but the man in the water didn’t grab on.

Spectators began to wonder if he was suicidal. One woman suggested to a neighbor that he was just pretending.

Finally, tourists at Venice’s Grand Canal began to laugh as 22-year-old Pateh Sabally of Gambia drowned in the canal’s icy waters. Sabally came to Italy two years ago and was living in the country legally. Last year, according to Italian …