Again: process the fact that you have NO idea what was going on. As I already stressed, I am not justifying their decision to visit the bar–I am pointing out that neither you, nor I, nor anyone else on these boards including the originator of this thread has any idea what the exact story was.
And yes, you DO need to know the story, and yes, it DOES make a huge difference. There can be a bigger chillul Hashem caused by yeshiva guys going to a kiddush (a seudas mitzva) than a bar. I’ve seen it many times.
Lgbg began this thread with, “Maybe it’s none of my business…”
So far, that’s the most admirable statement I’ve read.