That isn't the sin so much as voting for ones who do again. And even then that has the defense of being a systematic issue resulting from incentives and systems

That isn't the sin so much as voting for ones who do again. And even then that has the defense of being a systematic issue resulting from incentives and systems of people. Given an incumbent advantage voting for a known lesser lower abuse of power in spite of professed stance against it may be preferred strategically to the a worse opposition who calls the abuse not far enough (WO or extra bad opposition for short). Primarying them would disadvantage them against the WO in exchange for potential getting someone who actually keeps the promise. A nasty resulting trap in the service of the status quo. The main answer for how not is pressure to reform the electoral system which unfortunately requires a critical mass of support and fervor for an abstract issue.