As in the previous volume of
The Hunger Games, it’s unclear how we’re to interpret Beetee as a character. Here Beetee seems somewhat sympathetic to Finnick’s mental struggles, but he also thinks that combat and new weaponry will make Finnick feel better, even though it’s clear that violence was what disturbed Finnick so greatly in the first place. It may just be that Beetee understands science very well, and human emotion not at all.