It certainly seemed like he was blaming them to me. When he taunts Sophia during their rematch, he basically calls her stupid for letting herself be charmed. He meets Tomoki face to face and defeats him, then heals him, then later after defeating Tomoki's goons he basically says "if you live or die it's just luck." After he defeats Haruka, he says it's because of her daughter that he spared her, saying "in my opinion, the best way to save you would be to let you die."
The author set up the story that way and justified it that way. But I know war vets who struggle with deep personal guilt in real life, people who regret and never forget the things they've done. The author's solution, glorifying suicide, pisses me off. I can only imagine that the author had zero real experience with people with trauma.