Most radical believers in anything are completely deranged and inhumane. People blowing up abortion clinics with the staff still inside them, because they believe in “the sanctity of life" comes to mind. But anyone who can divide the world into those who believe x and those who don’t believe x, where x is the single most important issue of their worldview, so that not-believing equates to against, feels justified at any level of excessive retaliation and wrong action. It then feels like action taken against those who are against the issue is action taken for the issue. Which just goes to show how intractable most of these big issues are, that it’s impossible to take more meaningful action.