Meursault's Outburst

At the end of The Stranger, we see Meursault explode at the chaplain in his cell. I was somewhat relieved to see this type of behavior from him; it was reassuring to see proof that he does have emotion. Through all the events that we see Meursault go through, he remains indifferent and unemotional through it all. Even the jury at his own trial is bothered by this. Arguably, the reason he is being executed by guillotine is not because of his crime, but because of his character. So then, why does this moment with the chaplain cause Meursault to have such a sudden uncharacteristic outburst?
Meursault knows that he is about to die, and feels that suddenly believing in God will not change that fact and would be a waste of his last moments. He has gone his entire life not believing in God, so why would he start now? Throughout The Stranger, we see many examples of Meursault's "go with the flow" personality, where he normally takes the path of least resistance, and lives by simply being and watching the world around him. After being put on trial for his crime, the prosecutor quickly goes from attacking Meursault for his crime, to attacking him for his character. During his trial, he constantly struggles with the urge to say something and defend his actions, but instead keeps his thoughts inside. It was the most emotion we had ever seen from Meursault. He even mentions wanting to cry after realizing that his personality was being scrutinized by the jury. He says that "for the first time in years I had this stupid urge to cry, because I could feel how much all these people hated me." Meursault feels that he was condemned to death because the jury sees him as a threat to society for who he is, not what he did. For that reason, when the chaplain shows up and tries to change him, he snaps. He feels the need to finally defend his choices and his lifestyle.
Yelling at the chaplain was Meursault's way of getting out all of the emotions he has been holding in since his trial. It was his own version of repentance, where he could get everything off of his chest before his execution. He asks the chaplain, "What would it matter if he were accused of murder and then executed because he didn't cry at his mother's funeral?" Ever since his sentence, he has been holding in these feelings and his outburst at the chaplain is his own version of confession. He mentions finally regaining a sense of himself and feeling happy again after yelling at the chaplain.  Although he knows he is still about to be executed, he is more calm and tranquil than we have ever seen him. Meursault seems to have finally been able to tell the world that he will not apologize for how he lives his life. When he was consumed with thoughts of how to escape his situation, he kept feeling a sense of longing and dissatisfaction. Now, he has let all of those feelings go and can feel good about himself. Meursault's situation has become utterly hopeless, but at the very least he has finally been able to get out the frustration that has been building up inside of him for so long.