/facepalm
That would greatly increase rdming.
Example: (Player A, Player B, Player C, and Player D are all innocent.)
Player A kills Player B for whatever reason(Suspicious or all-out rdm doesn't matter) and Player C sees this. Player C does not like Player A. Player C says "Oh look! Since he just killed an innocent now is my chance to rdm him! Either I kill him and get karma if he's T or I barely lose any karma if he's innocent." Player D sees Player C kill Player A and kills Player C.
This proccess would repeat and there would be a ton of chain rdm fights. Just don't shoot people as an innocent unless they shoot you first or if they are obviously a traitor.
That is one scenario, Scenario 2:
PLAYER A, B, C, and D are all innocent.
Player A kills player C because player A likes to rdm low karma players. Player D sees this, and thinks player A is the traitor, Player D kills player A and he loses 400 karma, while player A loses 60.