I agree with the previous poster. Parents like the Kents would be very attuned to their son's emotional pain, and after a tragedy like his, would be doubly concerned about their son's emotional state. They would also both be intuitive enough to see that their son might be at risk for suicide. I don't believe that the Kents would ignore the red flags raised by a potentially suicidal child.
I also have a hard time accepting a Superman who is so despairing and who just gives up. All in all, these seem like characters who have become rather distorted, perhaps to meet some other agenda of the author's.
