Very interesting discussion here. In my humble opinion, I think the delivery matters in the receiving of the content. Ultimately we are told to...
Let your speech always be with grace, as though seasoned with salt, so that you will know how you should respond to each person.
Colossians 4:6 NASB
Love and mercy should contain truth, and truth contain mercy and love. After all He is Love and He is Truth. He gives us a spirit of Love and a sound mind, telling us to be wise as serpents and gentle as doves. I think we should always be ambassadors for Christ, spreading His good news, knowing Christ's appeal is Gods'. With that said, when sharing the truth, its delivery is better received when wrapped in love. Otherwise the content is skewed because it lacks wisdom and heart, right? Don't get me wrong, I'm not suggesting we flatter or sugar down the truth. Not at all, quite the opposite: but ultimately our end goal is to point them to Christ, right? When seeking to be fishermen of people, truth, love and mercy should always be our go to bait.