It's impossible to be squeaky clean. Anyone who presents themselves as perfect only ends up attracting others who look for ways to rip them apart. "Oops, I made a mistake.'" Now if someone comes along to attempt to make me look bad for screwing up, because some people are demonic like that, I can just say, "Yeah. I fucked up. So what." That's the easiest way to take away those powers some think they have over others.