A valid point. That would be his father's burden. I would say he's more likely to blame him than himself.Even were I thinking only of my child, I'd take the chance on saving his peers rather than expecting him to process the guilt and PTSD of knowing he could have saved them but chose not to, for fear of what might have happened to him.
In a world of moral gray areas, I still think saving a school bus full of kids is kind of a no-brainer.
It is a legitimate fear though. Again with his "maybe", he's pointing out to Clark to be careful. He would probably still do things anyway, kids do. He would most likely be very selective because of the talk.