Hi! Jay thank you for your comment 

The true image of Divine Mercy is a reflection of our inner self, in our own Brokenness/sin/frailty before God, and the message that is manifest, calls out to those in deep sin who cannot receive the sacrament of reconciliation to place their trust in His Divine Mercy. 
So that when these words which have been given by Him are said publicly, with sincerity of heart, before this reflective image of their inner self  

 “Jesus I trust in thee” 

at that moment in time they are made clean before Him.

Yes very true we are all sinners called to repent (Change Direction) and in knowing this would we not delight in encouraging our brothers and sisters to change direction also, especially those who are entangled in a sinful situation.
Eventually we will all have to stand before God and give account for ourselves, He cannot be deceived and only He knows who is clean (sincere) before Him.

kevin your brother
In Christ