In my situation the bar was a corporate national chain in the downtown center with locations in most college towns (at least in my experience). They likely had video surveillance from every angle. The perpetrators may have even paid by credit card, been already known to others there, possibly even the staff, etc. Compared to the situation your friend's brother experienced it seems like there's a decent chance my assailants could be caught. As I said I'd been talking to them for an hour, left with them, etc. Video wouldn't be tough to get.
I often wonder if it was a one-off crime of opportunity or some MO/pattern of theirs. No way to know I suppose but given my case they certainly wouldn't have any reason not to do it again.
I feel bad that my inability to deal with this could contribute to it happening to someone else. But, certainly at that time, I just couldn’t bring myself to even talk about it.
Oddly, years later, I can talk about it on HN and think nothing of it. Occasionally my friends will have me tell the story to someone else and we’ll all laugh about it (occasionally to the horror of anyone hearing it for the first time).
It’s been a very strange experience.
"Comedy is tragedy plus time."