Ah that ep was like one of the best! My jaw was on the floor. It was super unpredictable
I think some people dont care about trowing out their humanity when it comes to punish someone that did such henious things. Like some people would go on a pedo killing spree for exemple. Also sometimes criminals just get the """wrong person""" (not that there is a right victim obviously) a person that does not care about societal morals around revenge that much, that only needs a little push.
The "ethics" of that revenge kinda dont matter for this group of people. They wont care about "two wrongs wont make a right" or cliche stuff like that, cause they aint trying to make it right in the first place.

its not exactly the same and some people might not get this but this series really reminds me of Netflix’s black mirror episode , “White Bear”. f you know, you know.
I know with series like this the biggest conversation topic/argument is, “fiction doesn’t affect reality” or something to that point, but this and white bear like I mention really does make you question people’s ability to keep their humanity with wanting to get revenge on someone , especially when the key point is that the character getting revenged on is suffering from “amnesia”. It’s always a tough watch/read but I’m just a little bias on that because I’m really queasy with black flag stories.