I mean, these could be very reliable findings. But they rest on some major assumptions: 1. that psychopathy is at the level of brain a single thing. 2. that the analyses included in the met-analysis are not biased at all...
...and 3. that the size of different brain regions is relatable to (and explains differences in) complex psychological functions like moral reasoning
Again, it *could*, but it's a very crude measure and conceptually naive hypothesis, IMO: Are bigger bits of brains better? wiringthebrain.com/2020/08/are-bi… 
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