Humans depend on life to have some sort of meaning, without meaning then we feel hopeless.
This is what I find strange. Why does life have to have a meaning? Let's imagine for a moment that we had proof that there was no consciousness beyond this life. Would that really change anything? Many people believe that only humans have "SOULS" and the rest of the life on this planet just dies. If this is the case is it not more tragic when a non human animal loses its life? I would rationalize that the life without a soul is more valuable being the only life it will ever have. I would go so far as to say that there is no loss in death and no meaning in life if you are just to be reborn again. Life would be as pointless as dieing in a video game. (Oops I'm dead. Its a good thing I have infinite lives)
I would like to offer up a simple but effective example.
(Lets imagine that cars were free so they have no physical worth just practical)
If you were given a car and you knew it was the only car you were ever going to own would you not take great care of it? Conversely if you were given a new car every time the previous car could no longer operate would you service it regularly?