Quoting Jude ♥ JGL:" <blockquote><b>Quoting Niklaus:</b>" Yeah, but it's a real-time threat. Taking out ... [snip!] ... I get what you're saying. And when you don't believe in predestination I guess it would be the same thing."
Yeah, that is probably the biggest argument. Because if someone could go back in time and stop something terrible from happening like.. the Holocaust, by killing Hitler as a child. I'm sure we'd all agree to it. But that is looking back on it already knowing what happened. I'm sure that the people living in that time would disagree (when he was a child, obviously)