Easy. He’s a sociopath and is just playing a role. He has no remorse, no emotion, and until now, nobody has called him on it.
Wow! Father Pavone says it beautifully.
The banality of evil. Many of the functionaries of the Holocaust saw themselves as respectable middle class bureaucrats doing a difficult job. They were proud of doing it well and efficiently. That is why they kept the meticulous records that would condemn them at Nuremberg.
I see the same mentality at work here.