Which is a phrase about why fighting fire with fire doesn't solve anything: it just makes the fire stronger. I responded at length to another person: systematically take apart their teachings and make it known. But don't make them martyrs. In this day and age, especially, making them martyrs makes them right and you will lose far far more supporters or potential supporters that way. Take them apart, systematically, and publish it, and invite people with kindness and open arms, you will gain far more supporters. This is the best and moral way. Never use the evils of your enemies to fight your enemies: you become the enemy. Less hate and destruction; more thinking, love, and construction. Fight fire with water.