People have always been this way, and there will always be bad things happening, the important thing to remember is that there is more good in this world than there is bad.
To respond to your statements about people in Africa dying, there are a lot of people doing what they can to decrease mortality in third world countries so I don't think its fair to say that no one is doing anything. Could more be done? Yes. But, in order for one country to help others, the country that is trying to help has to be stable.
Unfortunately there will always be conflict among different religions, but there are a lot of people trying to change that especially among younger generations who are so much more open minded.
Are there a lot of cruel and heartless people in this world? Yes. But there are many many more good people out there.
Another thing, it doesn't help anybody to keep sitting here whining about the bad in the world, if you want things to change, get out there and change it.