Eternal life is a much more terrifying prospect than death.
Without pain, joy becomes meaningless. Without death, life becomes meaningless. Mortality is our greatest gift; it makes everything more beautiful.
That's false. And you only say it because you've never experienced true perfection.
I haven't either, by the way.
You may be absolutely right. Joy and pain, when reduced from their abstract form and speaking from a strictly clinical viewpoint, merely exist as chemicals in the brain anyways. I would argue that true joy in life is the result of many, many other factors that can't necessarily be accounted for or measured biologically; and a major example of one of these factors is the sense and ultimate knowledge that your days on this earth are limited, and therefore immeasurably more precious. Not to mention, an existence in which everyone lived forever, or certainly one in which some die and others live forever, would be a horrible, horrible reality.
Life and death are an absolute necessity to existence even as we, as consciously aware beings, naturally question and struggle with the meaning behind our own existence. The natural instinct to avoid death and our fear of loss of control and the unknown blind us to the truth right in front of our faces. Plus the guy was asking why death shouldn't be so scary and I'm trying to help the dude out here.