Despite the advent of the internet, I still occasionally get religious people who approach me with the intent of converting me into a Known Bad and cramming me into the bottom of their crazy Pyramid Scheme. Here's how to shut that down.
Look them square in the eye, establish a mental connection and say with sincerity and concern, but also just loudly enough for others to hear, "I'm asking YOU this personally. Do YOU, yes YOU. Do YOU rape children... or ... or ... do YOU just give money and power to people who do?" Give it just a second to soak in and then continue while gently shaking your head in disbelief, "Because honestly, either way, MY conscious just would not allow ME to be PERSONALLY involved in something so disgusting." Then, before they can even formulate a response, give them your best shame-on-you, I-think-you-just-farted-and-it-smells-really-bad face and walk away.
For someone so tired of living in a sub-standard society that is fueled by LIES, it seems like a simple way to create a positive change in the world. If nothing else it moves YOU from EFFECT to CAUSE.
Should work wonders on the "Merry Christmas" crowd as well!