There's a certain level of bastardhood at which it becomes hard to feel sympathy for someone's demise. I don't know which side of the line Thomas Midgley Jr. is on, but he's reeeaaal close to it.
CFCs are a pretty important invention even today and leaded paint and fuel probably seemed like a good idea at the time since no evidence suggested otherwise for a long while after it's introduction and commercialization. Unless he concealed information about known dangers, I think it's illogical to fault him to the point of celebrating his untimely death due to it.