Does a Christian Have to Forgive His Son’s Murderer?
No, at least, not preemptively. Any time you see a self-professed Christian preemptively forgiving someone who has neither repented nor sought forgiveness, you should recognize the sulfurous stink of Churchianity.
According to His Word, God doesn’t forgive the unrepentant. Which indicates Man not only doesn’t have to, it means he can’t.