Hi Manesha, I don't blame RK for going to meet Sultan or for surrendering. Whatever he did was very human and understandable.
If you see, he went through so much in a short span of a couple of days. Just because one person, Sultan, a person who he already hated, his father and he got defamed, his idol got broken, his name got tarnished in front of the worldand then his wife also tells him that the same person has ill thoughts about her and is waiting for her to come in the morning to him.He did what any honorable husband would do. He didn't want to kill him but he was in rage (Can you blame him? Things that happened to him because of Sultan can turn the most calm person into Hulk), still he was controlling his temper until Sultan insulted Madhu and then Sultan got killed. So, obviously he had to surrender he is not a psychopath who can easily make his mind okay with what happened. He knew he did wrong and to clear his conscience of guilt of killing a person, he surrendered like a responsible citizen.We all know RK has a great IQ but that doesn't make him less human. He has gone through a lot. In a couple of days his whole existence was questioned in front of the world and his world collapsed. So, like every human being he needs time to create himself again, it will be unfair to think that he should snap out of the biggest trauma of his life so quickly.