We can never know or speak for why anyone does anything, unless we're relaying what the person says, because no matter what kind of act we're speaking of, the only ones who can speak for someone's intentions is that person. Anything else is putting words in their mouth, an educated guess, based on what we see and not what we don't. People should stop emphasizing motives as much as they do. Sometimes a motive might not even be able to be manifested in words while still existing.