Nice idea, but I doubt the trolls will bite. They seem more interested in getting other people riled up and getting a rise out of them, so they tend to target threads where they know other people will be posting their condolences.
It's still tasteless.
I thought maybe since giving my 5, 6 and 10 yr old an outlet sometimes works, maybe this would work also.
i.e. They're being their usal selves.
Most of the naysaying posts can be translated as: "He was rich & famous and I'm not so I'm gonna talk sh*t about him."