He can grieve however he wants but this stronger for forgiveness narrative needs to stop. Not forgiving someone for murdering your family is in no way shape or form an indication that you are a less good person. The opposite of forgiveness would have been his family calling for or carrying out violence against her or her family as reprisal.
A sexual assault survivor isn't lesser for not forgiving their abuser. An adult that cuts off contact with their abusive parent to lead a life that's most conducive to their well-being isn't lesser because forging a relationship with them isn't possible without harming their mental health.
This is especially true when the person responsible does everything they can to not own up to their actions until they have no choice all while agreeing to disparage the victim in the hope they can get off with minimal or no penalty.
The world will be a better place when privileged people put the plight of marginalized people as an actual priority so they don't have to keep forgiving people for brutalizing them in the hopes that it gets people to see them as equals.
Black people have been forgiving white killers forever in America and the lesson hasn't been learned yet. So entirely miss me with this bullshit that being the better person involves forgiveness and is the correct path forward.
For those that can endure reading it here's a past instance. Wanted to warn prior though as it does talk about a 1981 lynching.
Nearly 40 years later and people are still beating black people over the head that this is what the takeaway should be.