In self-defense, we have talked about "escape", "de-escalation", "avoid fighting", ... . Sometime you can run, not to get involved, ... but should you? Will you risk your life to save others?
You are asking a
moral question, not a self-defense question. Do you understand the difference?
Self-defense is self-describing. It is defense of self. Not others. Otherwise, it would be called just 'defense'.
One might extend the definition slightly to include defense of family, loved ones, even those whom you are with. But a bus full of passengers? In what way is that self-defense?
Now, having said that; I certainly hope I would have the courage to stand up to aggression like the man who got cut in your video.
In the USA, we have the example of the people who fought back against the hijackers of the doomed airplane on 9/11.
United Airlines Flight 93 - Wikipedia
We also have the recollection of the supposed story of Kitty Genovese, which was the opposite, more like the passengers on the bus in your video.
Murder of Kitty Genovese - Wikipedia
The following clip is a true story. 2 guys raped the female bus driver. 1 guy tried to help and got cut. The whole bus full passengers just watched, nobody else wanted to get involved. Later on the female bus driver crashed the bus, killed everybody in the bus include herself.
I don't know if it is a true story or not. It's in Chinese, right? I don't speak Chinese. I got the idea, though.
What's your opinion about this clip?
My opinion is that there are some things worth fighting for, even worth dying for. I should know; I served in the US Marine Corps, I carried an M16 for my country. I volunteered. If I had been ordered to fight, I would have fought. If it had led to my death, I was willing to pay that price. What more do you want of me?
I also believe that macho posturing is stupid. There are far too many people who like to spout off about 'dying on their feet' versus 'living on their knees'. Too many people who refuse to see life as a series of choices and gradations, where very little is truly black and white. To them, you either fight at the drop of a hat, at the slightest insult, or you are an abject coward, who snivels and pleads for your life. No in-between. Fortunately, most such idiots are simply poseurs. I doubt they've even been in a real fight in their lives, they live Walter Mitty dreams and think themselves manly. Whatever. I suffer such fools not gladly, to be quite honest.
With regard to self-defense and the defense of others, I will say this - there is a reason that the flight attendant on airplanes tells you to put your own oxygen mask on before assisting others. It's because if you do not look to your own defense first, you are dead and of no use to anyone.
We speak of the shame of running away and leaving our wife to be raped (yes, I read that in the last thread), but it is seldom that simple. And assuming it was, we stand there and become a murder victim; well we won't be helping our wife anymore, will we? She'll still be raped (in that absolutist, black-and-white scenario) but now we will be unable to assist her in any way - including assisting her with her recovery later on. So now she'll be raped and living life without a husband as well. All of the sake of not seeming to be a coward. Sounds brilliant.