He is the creator of the universe and everything. Without his will nothing wont happen. The stars and planets are functioning(in orbits) according to him. He created the world and the beings according to their karma and watching the play. In his hand all the beings are just an instrument. The beings are doing karma by thought(if they can thing), word(if they can speak)and deed(by action what are doing). God is watching the play and witnessing. So no one can't blame him, they have to accept karma
In any form it is wrong. Doing violent thing that's mean making bad karma. Every action have a reaction like that you will get it back. Human beings have a thinking power, they can analyse and avoid to be violent. The world is facing problem because there is some doesn't have fear of sin.