Yes Vince, there should be a life after death. This world and the human lives have strong evidences to support the fact.
1) Everything has been created in pairs, heavens and earth, day and night, man and woman.... fruits, animals even in vegetation one can find pairs... the atoms, the particles, poles... have there pairs.
So for this world the next and for this life the life Hereafter is but the respective pair.
2) This world doesn't recompense. Take for instance virtues. No rewards for righteous deeds can justify. So there should be another life wherein one can enjoy the rewards of his/her virtuous deeds, there you have concept of Paradise.
Similarly, for evil deeds the punishment doesn't justify, if some one kills many, then what punishment can be termed as justifiable for him? He can't be killed as many times... So there should a life wherein he should be severely punished for his crimes before those who were sufferer.
3) There is a definite purpose of the universe and whatever exist here, so as the world and the human lives.... the life Hereafter is going to be a benchmark to judge how far the lives of individuals and groups were according to the purpose with which they have been bought to existence?
This way if one thinks, there may appear logical, rational and moral reasons behind the existence of life Hereafter.