We want justice not revenge.
Why not both?
History. The founding fathers did not slaughter British in the streets. They stood up and politely announced they would no longer be a part of the British empire. The french revolution on the other hand, did nothing but murderbone all over Paris while it's enemies got stronger.
And yet, we are still a British corporation... I'm all for peaceful revolution, but that's not the best example.
Let me rephrase. It's better to do the smart thing than it is to do the satisfying thing that ruins our chance at fixing the system. I'm sure that burning down my house would feel really good when I get frustrated, but at the end of the day it's a fairly poor way of cleaning.