At this point, focus should be on the future enemy(-ies) then variks. Do I think he will answer for his crimes? No. I don't see the vanguard or awoken as being that strong to do so. Will he be used as a tool for the rest of his life as a result? Absolutely. He is Variks, betrayer of the Awoken Queen. Anywho contest his eventual demise by the painful and bloody end (possibly us too) is too foolish to realize the negative karma of killing a hunter vanguard. As for Uldren. He joined the winning team. Europa is only part of the solution. The rest is going to be bloody conflict after bloody conflict. If you are a pacifist by nature? Realize the obvious statement: "Violence is never the answer. You are correct. It is the question."