My response is that what we do know is that, like light, an electron travels from one place to another like a wave. What we also know is that it behaves as a particle when it interacts with a detector. What we cannot and should not assume is that the electron must be one or the other.
Work Step by Step
The complementarity principle (pages 595-596) says the electron can exhibit the complementary properties of either, depending on the observation that we make.