Is Forgiveness Really Necessary?

We all know that Jesus taught us to forgive. If your brother trespasses against you seven times in a day, Jesus says to forgive. Okay, while this may be difficult, we can see its value and strive to live up to that standard. But, but what about when someone commits a horrible crime – what about when someone guns down in cold blood, innocent God fearing people in church – at a Bible study? Is the same lesson of forgiveness relevant? Do the teachings of Jesus include forgiving those who are simply and purely evil in their actions?