Funny until it makes you sad, “The Day Shall Come” may lack the bitingly mundane bleakness of “Four Lions” thanks to its sunny Florida setting, but it’s no less depressing as it exposes the farcical side of false flag operations.

Moses Al Shabazz (Marchánt Davis) is a self-styled radical black preacher plotting to overthrow the white man and take on the forces of gentrification from his urban…