In discerning and reviewing the premise of your O.P. I have to say that I have struggled with this notion for many years now. When I finally embraced the Word of God I also acquired a concern for my fellow man and I think the two related. I guess I question the way this concern manifested itself at times.
I recently finished an 8 year stint as a self published investigative reporter in an attempt to root out corruption in local government and make manifest an environment conducive to raising a family. I went at it hammer and tong with D.A.'s, Judges, Sheriff's and Mayors. Suffice to say there was a price to be paid for that and my family paid it. I don't know that I was ever fully able to make them understand that I was doing it for them. I don't know if I fully understand whether or not it was my obligation to do it either but, at the time, I felt it was.
Whether to passively accept or actively participate in our governance is a question that Christianity has long struggled with. On the one hand we are encouraged to submit and, on the other, thirst for righteousness. The concept of an elective democracy depends on an honest and informed electorate and I'm not sure we have either at this point. I guess if I were to offer any advice on the subject I would say take care of your family first and participate in the societal endeavor as you're are able and inclined. That said, don't rob too much from your family to fight what is likely a lost cause. God is able to uphold those that are His in all circumstances and countries regardless of what system of government they are under. Just make sure you are one of His.