Ignoring a life threatening problem that you know exists, is tantamount to a slow suicide. Yet, many churches refuse to deal with such a threat.
Sexual sin and pornography are that sickness.
Much like mold that's growing behind a wall, under a floor or in a dark basement corner, are pornography discussions in the church. They are icky and people would rather not hear about it and, want someone else to deal with it, if at all.
In other words, it's left up to those who are willing, if any, to get their hands dirty, messy and to clean it up.