God had to do certain things in order for his master plan to come to fruition. Specifically that Jesus could be born into the world and go to the cross to save mankind and now I think that all the dominoes have to fall for the rest of his plan to take place. His will is for everyone to get saved, so we're in this grace period where anyone who calls on his son can receive eternal life, and we wait and try to get as many people on the rescue boats, so to speak.
Also.
When we were children and our parents, who had much more knowledge than we had, gave us rules or instructions what did we do? We threw a fit and cried about how unfair they were. We may have assumed they were cruel and didn't love us. But then we grew up and realized they were right and we didn't fully understand the way the world works. I think it is similar with God and us, his children.