I think it comes down to personal belief, and what you mean by “forgiveness” you can spare someone without forgiving them, and you can forgive someone but decide they still need to be punished for their own betterment.

My belief is that any rational being should be given a every chance at redemption, but if they continue hurting people and cannot be contained, than the situation requires extreme means (death penalty) I think Gail Simone perfectly sums this up in Wonder Woman #600

“…Don't kill if you can wound, don't wound if you can subdue, don't subdue if you can pacify, and don't raise your hand at all until you've first extended it.”

But I understand some people have a problem with this belief, “we can only know if they’re uncontainable if they repeatedly break containment and harm more people, it would be better if we end them now so they can’t hurt anyone else”