This line really highlights the colonizing nature of Prospero to both Caliban and the island. After attempting to be helpful and kind, Prospero captures and controls him. At the same time however, it is impossible for me to think of Caliban as innocent as he tries to rape Miranda, even though I understand that Shakespeare wrote it that way to dehumanize Caliban. It reminds me of Othello, because even though he was punished and manipulated because he was black, he still murdered his wife. Looking through different lenses helps to remove the action from what we think is the author's intention.