I think the main thing in this is how you view CK/Superman. Is he somewhat of a international resource, or he is more of a person with extraordinary abilities?

Also, if he did become actively involved in fighting hunger and disease in third world countries, how do you think that would affect him? He struggles with getting over disasters where he is unable to save a few. What do you think his reaction would be to viewing all the problems the world's less fortunate have?

Personally, I don't believe his caring heart would be able to stand an ongoing effort like that because he would likely wear himself out mentally trying to do all that he could.

I think, therefore, I get bananas.

When in doubt, think about time travel conundrums. You'll confuse yourself so you can forget what you were in doubt about.

What's the difference between ignorance, apathy, and ambivalence?
I don't know and I don't care one way or the other.