In fairness, the search for closure and a more concrete explanation is really common in the wake of a suicide. Who wants to accept that a loved one was in so much psychic pain that they would end their life, for reasons that seem arbitrary, obscure, and unsolvable? That shit's really sad and really scary.
Of course our buddy here is taking it the next step and trying to be Columbo for dead celebrities he's never meant, but everyone has a different grieving process.