I don’t think I’ve ever seen anyone write about the Flight of the Noldor with the honestly reasonable argument, “Why don’t we all wait until Finwë returns from Mandos and see what he has to say?” and I can only assume it’s because we all intuitively agree that Fëanor does not for a second think his father is going to return, ever. Parents don’t return from Mandos, especially when their death is your fault; that’s just another pretty lie the Valar tell to make you stop weeping and shouting.