I am not sure why people blame God for evil, I know for myself, when I have prayed and prayed, and it seemed to turn out the way I did not want it to, it made me wonder if God even heard. Or what did I do that He was allowing this to happen? But I know that all things work for the good of those who love HIM. At the time I may have been blind to God's molding of me, but when through the fire you can look back and see that it was not God tempting you, but the bad decisions you made.
Evil exists because we are born sinnful creatures who are in need of a savior. We need Jesus, and without him we are naturally destructive to ourselves, to everyone and everything around us.
Angie