If you empathise with someone who is suffering then clearly you will grieve for them and with them but I think we are talking about different things. Yes, I agree with you that those who die for want of food or water or because of conflicts or disease can be said to die needlessly and so I guess you can say such deaths are meaningless. There is no majestic power directing or controlling those deaths for a higher purpose. They were born , they suffered and they died. I get that. But that doesn't mean our existence as human beings on this planet is meaningless. We give our own meaning to our lives and hopefully to those we can reach out to. At the same time, we must also realise that life as we have created it lends itself to suffering, chaos and disorder. I guess it is easy for us to be consumed by that darker side of our nature. All I can say is "cheer up", you can't save the world but if you are doing things to improve the lives of others then you are leading a meaningful and distinguished life and someone will remember you after you die.