You are unjustifiably separating the two. It is your actions that determine both whether or not you address the issue with a malefactor, or that you forgive them. How can you give both a different context? One will know by my actions if I've confronted someone about their sin, and whether or not I've forgiven them. The two facets within that one context, goes hand-in-hand.'for he lets his Sun shine on the good and bad alike'
Evil needs to be addressed, there is no question about that but we are talking about forgiveness; the two both have a context. By forgiving one does not sanction evil; it rises above it, neither does it close its eye to it's heinous nature.
For example, play it out for me how you would react to someone who just killed another. Explain to me how you would both address the crime with him, and exude your forgiveness? Do you call the police and have him incarcerated, or do you rebuke him and then invite him out for dinner or have him meet your friends? Let me see you put two and two together, and then tell me that there doesn't come a time where you just must treat them as a 'pagan or tax collector'? ...and, that that's the best remedy for their rehabilitation.