The brother of the victim forgave. That’s his own personal choice but should not affect just sentencing nor is it a model for others to follow in these situations as a matter of policy prior to sentencing.
Righteous indignation is a powerful force and it has a rightful place in the order of things. There is a point where forgiveness is possible and can be therapeutic (good psychologically / for the soul as it were) but not as a prescription to follow blindly as “We live in a society” and bad actions left uncorrected can become bad models for others to follow.
As a personal policy, I forgive those who wrong me BUT I also adjust my levels of trust as a preventative measure for future encounters.