Earlier quoted context omitted.
" he was apparently good at managing the program." That's one thing a lot of people don't understand. A lot of these monsters aren't just monsters but they are also very capable. Beria was a good manager, so was Himmler who led the Nazi SS. Stalin also was a hard worker and a master bureaucrat.
There is a really interesting take on Beria in what is possibly the best Stalin's biography ("Court of the Red Tzar"). Apparently, Beria saw himself a successor to Stalin who would put the country onto a milder course, and he was looking forward to redeeming himself in the face of history. There was something to the effect of him saying that his children would get educated at Oxford. And he did not mean it how curren…
They were "murderous bureaucrats" for whom mass murder was a faceless statistics. They would not fret or get emotional about it neither before nor after the fact.
A glimpse of artistic rendition of how plain and "bureaucratic" a mass murder machine could be is a historic re-enactment movie "Conspiracy" [0] about Wannsee conference of 1942 (it is about Nazi Germany not USSR but the theme of "murderous bureaucracy" seems to be universal).