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Not compareable. Stark has created working A.I that he has full control over before. Him assuming he could control Ultron was in character and understandable. He's done it before. Lex however hasn't created life before. That's the difference.
Also, Stark never meant for Ultron to become aware when it did AND he left JARVIS behind as a failsafe just in case. There was no reason for Stark to expect that Ultron would activate on its own AND destroy JARVIS in a matter of seconds without Stark even being present.
And despite all of that, he was heavily criticized in universe (including by himself) for screwing up.
It isn't remotely the same thing as Luthor's stupidity.

t: though my comments weren't meant in a personal way just FYI.