Devils advocate is an attribute little people have and more should implore, motivates discussion. Good on you. As for clark receiving encouragement, I see where you are coming from but I feel such rhetoric is indicative of a simplified approach to characterization and indicative of a simplified audience. I personally don't think characters should be treated as simpletons where the communication need be simple to be understood, whether they be kids or adults. A film like Stand By Me for example. They are complex individuals whose motivation results from a great deal more than 'that one time pa patted encouraged them'.
Characters should weigh and struggle with all sorts of moral and instances thrown at them and characterization should result from the decisions they then make. For example, why did Parker let that robber go? I mean didn't Ben already tell him 'what's best in life'? There is alot more that goes into why parker does what he does than just a speech(he didn't listen to the first time), alot he goes through after as well...
This is the same deal in MOS, only we fans are so used to/ready, for it to be simplified and direct. All that said, why does superman choose to help people as best he can and in the way that he can? Cause that's what his life experience made him into. Not simply cause Pa patted him on his head that one time. And cause pa kent told him not to kill...ugh.
I love his line about, is 'human worth trusting'. He obviously didn't just skim though those philosophy books.