What exactly was the top hat expecting? He took the MC from an utterly miserably death and made him the king of a planet. He hasn't needed to do anything much as a king. The place has pretty much developed on its own and under the butler and robot maid's care. MC himself is mostly concentrating on his studies and training, which have been rewarding, but also have kept him so busy he doesn't need to spend time remembering the horrible end of his previous life. It would be strange if he wasn't grateful.
At this point, it seems he's lived almost as long, or longer, in this world than his first world.
That's bound to give him a more nuanced perspective on things.
He'll always hate corruption. He'll always hate cheaters. But he won't let that hatred leak into his treatment of people who don't fit into those categories. After all, when he was reincarnated, he retains the memories, and more importantly personality, that decades of his previous life instilled in him.
Once you've spent thirty or forty years one way, it's very difficult to significantly change your personality.