There are plenty of non-Christians here who don't cause a scene. I understand what you're saying, but I still think you're giving trolls far too much credit. They often drops bombs and leave and laugh at the chaos they've created. Hurting people hurt people, I know that. But these trolls are banned for good reasons. Some have stayed on here for a very long time, so they've been given plenty of time to reform. But do they even try? No.
I understand what you're saying and you are probably right. I am a very optimistic person and have a tendency to search for the best in people. I know a lot of trolls will simply aim to cause chaos, but for the few that may want to grow, I feel an extra effort to suss through them is worth it. Its beautiful when you can find those people who are just a little bit harder to understand and have so much to offer when they see they are cared about. It may be rare, but like I said, even if one person is reached in that time, that's just as important if 100 people were reached with no effort.