Ultron claimed the Avengers were hypocrites for trying to protect the world without wanting to change it.
What did they he expect them to do to stop being hypocrites?
Regardless of other means Ultron has had (like gathering intelligence on a special substance he was looking for), was his treatment of Strucker also a demonstration how things should be done to actually achieve peace?
Ultron kills Strucker (who Captain America handed over to NATO) in his cell and writes "PEACE" in Strucker's own blood. Did he try to show peace is won by not showing mercy to the opposing leaders?
If so, didn't Ultron care Why did Iron Man give a different treatment to Dr. List?