do you personally think there's an Eridandiscourse or is he "pure evil"?

If there is an Eridan discourse it’s mostly people going “Eridan is a bad guy” and then people replying with “Okay, but he was doing it for X reason”, and then someone going 

and that’s basically that. Eridan isn’t as complex a character as Vriska or Gamzee so there’s not as much material to form an argument around. Plus he killed Feferi, a person he had been salty about not dating him for the entire story so there was less sympathy for him because it felt like something that could probably happen in real life (just with less white magic and lasers). That’s my interpretation of the matter at least