The power goes to Tony's head

Anything he wanted. All his deepest desires, they were his if he wanted them. He could show Steve that he was right, that the idea of Ultron hadn't been a mistake, only the execution. Of course, he didn't have to do that, he could just make it so Ultron never happened, wipe that event from history. He could bring back those who had died in the Incident, those who had been killed in the Dark Elf invasion. Reality was his now, his to shape, his to own.

He was, in essence, a god.

He had always known that he was right, that he knew what was best. Now, he could back that up. He controlled the future of the universe. He didn't even need to rush, he could simply command himself back in time if something truly awful happened. Reality was at his pleasure, and his pleasure was reality.

Tony knew what he wanted, and he had no reason to stop himself from taking it. Morals meant nothing when any action could be undone. As long as he could change everything back, he saw no reason not to do anything he wanted, to anyone. His conscience was clean, no matter what. After all, he was a god. Everyone else was only there to please him. Speaking of pleasing him...

"The Avengers all obey me, without question. They are happy to do whatever I say." He wanted good servants, and now he had them.