He still does care about us. Even when it looks like he just allows sin for no reason. The truth is, God wants us to be on the right path, a path leading to God. And when we don't follow that path, there is always some pain along the way.
If you remember the Jews, they were not sin free. Well, no one is sin free. We will choose the wrong path always. We are reluctant to pain, so we choose the right path. Those sins from all those innocent people were sure to lead to something. It was punishment for abandoning God, a punishment for sin.
But all in all, God lets us choose what path we go on, but God wants us on the right path so we don't encounter evil, and evil includes pain. It is basically how parents taught their children. I know it sounds awful and in my perspective, i does feel awful. But know that if God never cared about anyone then we would fall into evil to be tormented.