I suppose one risk of over-rationalizing death
is failing to appreciate life. When you manage to
stop fearing the idea of dying, you had better make
damn sure you appreciate why you're living- doubly so if
you're a skeptic without a Deity telling you taking
your own life is wrong.
I can't tell you why life is worth living, or what the point of life is, though I suspect part of the point is to figure out what the point is. I do think life is better than death because it's interesting; that alone is a start of a reason to keep dancing.