Get deep with me as I ponder things.
Let's argue when we die, an afterlife exists. Let's use the common Heaven/Hell concept- Happy/Torture.
In a torture scenario, anyone would go insane in hours to days based on pain tolerance. You'd have no awareness of self= Madness.
In a happy scenario, you would eventually experience every single thing possible to do, and still have eternity ahead. Boredom would ensue= Madness.
What positive outcome to death can there be, given ceasing to exist sucks?