Ilyana's post is pretty spot on. It's not something that gets balanced for, since Trib has very 'unbalanced' abilities (being able to warrant and murder someone 40 levels below you is pretty unique).

Tribunal isn't meant to be "balanced" in cabalwars with random cabals. Trib has great abilities in cities, and warrants are pretty gutting to most characters.

My response answered the questions, since I didn't feel like there was anything to argue or justify.

-Ish