Question

Hi everyone so today I have been putting a lot of thought into a question my brother asked me about oh five years ago before he went AWOL on me.
Why do we care? At the end of the day we are dealing with either dying happy, sick, healthy, lonely, loved, hated, Ect,. So why do we care? what is the importance of caring if at the end of the day we are all dead anyways.
I am still after five years thinking and trying to answer this question myself, sadly I have yet to come up with an answer. Which is why I now ask you the same question, to ask yourself.