death is basically existance in samsara, where all created things arise and cease every conventionally labelled event is a cycle of birth and death
so another question i pose to you: if you are a mostly a jerk and die in an unwholesome mind state with deep sankaras from evil deeds and with subsequent misery, what difference does it make when the physical body decomposes? how do you know that all 'self' dies when the physical body dies? have you died? is this existance your only chance to realise the deathless?