This concept is based off of an scp foundation wiki monster. http://www.scp-wiki.net/scp-231
The birth of a POV character causes the deaths of tens of millions of people. As that character matures and learns what the devastation they caused, he feels terribly guilty and ashamed, and he has to come to terms with the fact that he caused the deaths of 10 million people, as well as other significant damage around the world.
Given the remorse shown by more ordinary murders can be interpreted as crocodile tears, a way to gain sympathy in order to not be held responsible for a crime, or for leniency, how can I show this character's remorse for events he is responsible for but had no control over without making him a self-pitying whiner?