Church discipline is important, and love should be at its root. Not saying something to someone who is living in a way that is not in accordance with the will of God is not loving. That is akin to watching someone walking over a cliff and doing nothing to stop them. It is the duty of all of us to lovingly rebuke and exhort each other to follow Jesus. I have to admit that when it comes to the rebuking side of things that it is extremely difficult. None of us like it but in obedience to the Lord Jesus we must.