Why do bystanders fail to intervene when they see others in pain?

[BlueTsunami2018]

7. The attack was over in two seconds.

If you saw the video it was just bang bang and over. There wasn’t even any time to react to it, let alone intervene. This is just cold logic here but what obligation were they under to do anything about it? It didn’t happen in their place of work. They’re not cops, it’s not their job to arrest anyone or stop anyone. That dude was obviously a psycho, who knows if he had a gun or another weapon? Everyone likes to think they’d be this big hero but suppose that dude turned around and beat the shit out of them too or killed one of them? That was not a small dude and he was in quite a rage apparently. In my wild youth I might have jumped on the guy but I’m too old for that kind of bullshit now. I’m not getting my head beat in for anyone who isn’t my family.

I think it’s easy to say that they should have stopped the guy but most people want nothing to do with violence that doesn’t involve them personally. Get it on video and call the cops.

I don’t know what anyone was expected to do.