Some people help helpless animals, some people help helpless children, the difference I see between the two is the parents of the children weren't helpless, they are the ones responsible for creating their offspring.
Now I understand not all parentless children were the offspring of irresponsible parents and it's never the childrens fault, but it's not the animals fault either, they are after all animals that don't posess a real thinking and reasoning cerebral cortex like humans are supposed to have.
Starving children and neglected and abused animals will always be with us, as will the poor. Tragedy and suffering are part of the human condition, it won't change. I'm personally glad there are people that will help with children and people that will help with animals. If you can't see why people would help abused or neglected animals then I can only assume you have never experienced the true agape love that a dog or cat can give.