What's your point? Jonathan in the 1978 movie isn't exactly dealing with the same immediate dilemma or question and he isn't providing clear answers either. He just says his son has a purpose in life. Looking at the rest of the context from the
Man of Steel trailer, I don't see the two Jonathans as that far apart at all. In
Man of Steel, Jonathan goes from answering his son's question with a "maybe" because he's building up to telling Clark about his alien heritage. Pieces of the rest of that conversation have already been heard. He takes Clark into the barn where he shows him the spaceship that carried him from Krypton to Earth then says, "It's not from the Earth, Clark. And neither are you." "You're not just anyone," Jonathan continues. "One day, you're going to have to make a choice. You'll have to decide what kind of man you want to grow up to be. Whoever that man is, good character or bad, he's going to change the world."
Why is it hilarious? Jonathan isn't saying he wants his son to be bad or even saying he will be bad. He's simply allowing for other possibilities, like his son making potentially bad decisions in the future. He's making his son understand that what kind of person he becomes isn't his father's decision or anyone else's. It's his, and because that decision has the potential to change the world, he needs to consider his choices very wisely.
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