You might need to change your tactic or make the right opportunities but never stop, never quit.
You will probably never be thanked. You will most likely never be given an award. You probably won't be recognized until long after you've passed.
If you do a good job, you might end up in prison, being court marshaled, or dead but you know why you are doing it and even more importantly, God knows.
But BEFORE you run headfirst into it, evaluate if it's really for justice and if you get what you want if that WOULD be justice. A lot of times it's not for justice, it's for selfishness.
If it's hard for you to figure out WHY you are doing something, chances are it's probably not for the right reasons and if you don't have a solid why when the battle gets tough, you won't make it through.