I believe that humanity cannot be at peace unless humanity learns to forgive one another, and puts that learning into action by doing so. Making mistakes does not mean we cannot be at peace. But being unable to forgive for those mistakes, yes, I do think that means we will not find peace (for all). Not until we learn this. (now we can often forgive those we love, because we love them... not always so easy to forgive those we hate)
And no, I don't believe that any one group has a copyright on finding peace.
So what you are saying is forgiveness is the only way. I think that is a much more sensible way to put it.
-Sab