What a disappointment S02.E05 is. It was becoming more and more annoying throughout the series how the writers make each character a cold-blooded killer. It's not Finn who became a psychopath, it's the writers who went too mad to exaggerate the mankind's brutality. Now I guess we can expect Octavia to kill Lincoln (while saving her brother Bellamy, of course) or Bellamy to kill Lincoln or even Lincoln to kill Octavia or Bellamy, Clarke to kill her mother Abby, Raven to kill Finn (or Finn to kill himself), someone of Monty, Maya and Jasper to kill each other.
At start I was watching "The 100" as a sci-fi movie, now I finally realize it's more about a social fiction. And it's an experiment on us, the audience - to see our reaction, tolerance, aceptance and justifying of unjustified inhumanity.