So god is getting mad at you for failing to save you from the very thing he created and has the power to control?
God doesn't make anybody do anything. He didn't even make the angels follow him in Heaven. Lucifer rebelled and became Satan. If he didn't make the angels, which he created to serve him, do it out of their own will, why would he make us?
The thing is he wants you to follow him, but if you don't that's your choice.
Not that he is mad, because he knew what Adam would do all along. We were seperated from the perfect world he had set up when Adam sinned. Everybody has a sinful nature about them. The Bible talks about this when it says "there is none righteous". I can't go through everything the Bible says here. I'm not a Bible scholar. But the Bible is filled with stories of God loving man even though man did not love God.
God then started to make sacrifices and other styles of worship a requirement for fellowship with him. The main point the Bible makes is that he sent his son, Jesus, to the world to die for our sin as the final sacrifice. If you accept Jesus as your personal saviour, and turn away from sin (not saying that you will be perfect, because you won't be), then you have a place in his kingdom.
TO STAY ON TOPIC: The thing about the guys leg doesn't have anything to do with God not preventing it. That's just something that happens in day to day life. You learn from it and grow.