Ok, if you don't have an possible explanation for his motivation, that's fine. You are entitled to and should rely on your gut instinct because after all no one

Ok, if you don't have an possible explanation for his motivation, that's fine. You are entitled to and should rely on your gut instinct because after all no one here has the complete story. I think you should be careful to invoke Occam's razor like this though. It states: "Among competing hypotheses, the one with the fewest assumptions should be selected". You can't compare two hypotheses unless you express all of their respective assumptions.