Why? By your own words, you know that He who is all power knows already our plights. It is up to us to accept (i.e. not judge!) the world and it's problems (including our own shortcomings) in preparation for the next life.
We are not called to accept sin nor to condone sinful behavior in our midst. While we are not to judge the heart of another for only God can know it, we ARE to judge actions that are unacceptable and drive it away from us. God has always warned His people to put corruption away from them lest they themselves be corrupted.