I mean, if that guy was your brother.
No doubt, if you were in the victim's shoes, shoot that guy without remorse
The important part is that it was armed robbery with this
Honestly I as his bother would be pissed but after hearing the details I would let it go. Family is family sure, but there is a limit.
The family was just in victim (it's not our fault) mode. Some people accept the reality of the situation some don't.