Alex is quite right.
Further, Hitler was known to be, in general, squeamish about physical suffering. He hated cruelty to animals, for instance. He authorised torture of certain prisoners, but did not like to see it.
However, when he had a personal motive (for instance after the failed bomb-plot) he was quite ghoulish in his relish of the details of the executions. They were carried out grotesquely, and filmed for him to watch over and over.
I suggest that, put together, these details evince a partly-suppressed sado-masochistic streak.