When is it okay to be happy that someone is dead?

Billy Graham died. And I’ve seen several posts in my Facebook feed saying, in effect, “Good riddance.  The world is better without Billy Graham in it.”

I don’t know very much about Billy Graham, but I’m curious about this instinct to declare judgment on his life. How would one know whether Billy Graham had a net positive or net negative impact on the world?

The man had five kids, 19 grandchildren, and presumably even more great-grandchildren.  What impact will all of them have on the world? ...