Its been said several times that you should think of Tribunal more as an empire, not the good guy policemen. But if they are a big empire capable of evil things...aren't goods at least slightly sacrificing their morals by joining up?
I was one of the biggest people to bitch in support of Justice and Royal being combined, but what's being discusssed is an AGE OLD issue that has rearisen because the law cabal actually has some power now.
Everyone has a manifesto of their life.
Every character should be expected to carry that manifesto through until the end.
A greedy thief can be expected to kill, cheat and be caught by the tribs(that is such a cool gangster name for them).
A chaotic demon can be expected to slay anything and everything inside and outside of the city at his disgression.
A chaotic good, as described by the helpfile itself, should be expected to do what is right with TOTAL and ABSOLUTE DISREGUARD for whether a tribunal IS OR IS NOT PRESENT.
To a chaotic good, if a lightwalker has joined with a corrupt system, they have been tainted. They are still a lightwalker, but a mislead one. They would always prefer not to kill a lightwalker...but if they are inspired by their cause and believe they are endowed by their god with their powers in order to serve a worthy cause, they may at times be willing to kill good men whom turn on them and the light by serving a cause which, in their eyes, is corrupt.
They are left with two choices. They can surrender. If they surrender, they may be executed. They are not supposed to expect another life after that one, so for them it is the end. Their cause is over, anything they expected to get done...they can no longer do.
Their second option? They ride to combat with their opponent. Perhaps they will knock some sense into them literally, or perhaps they will be forced to kill a good man, but they are serving a greater good, the work of their god. They kill this man, who ATTACKED them...who tried to kill them in the name of an organization which is CORRUPT in their eyes and LEAD BY A VAMPIRE!!!
By killing the Tribunal, perhaps they have done something they did not want to. A good man has died, but he was tainted and corrupted by an idealogy which had corrupted and seized control of many a good man. His death is a sad story, but was in his own hands when he joined a corrupt society. It was not the wish of the chaotic good to kill this man...but he attacked him in the course of his good work, and he had no choice but to bring down this corrupted man. He is sorry for what he has done, but he realized that the fault rests, at least in most part, with the man for joining with an organization which prided itself on catching men...some of which walk the paths of light. When that man made that choice, he understood he was going to be tracking down and executing lightwalkers. He understand the consequences of joining such an organization and he CHOSE a path which could lead to this end.
By joining the tribunal he CHOSE to hunt down lightwalkers, By being chaotic the good CHOSE to defend himself.
It is not within the roleplay of a well played chaotic good to surrender. He believe the establishment is evil, and will bring it down at any cost.
Nor is it it within the roleplay of a well played chaotic good to pay any heed to the presence of tribunal.