I cannot speak for anyone on the bus. Were I the older guy I would have kept to myself. At the beginning of the video the younger man was not threatening anyone. Were I the older guy, I would have kept my mouth shut after relocating to the front of the bus, especially given the environs. I would have made an assumption that the younger guy may have been carrying a weapon.
Thugs and bullies are emboldened by such passive behavior. If you roll over and show your belly to a wolf, you're gonna get your guts ripped out.
You have three choices; you can be the wolf, you can be the sheep dog, or you can be the sheep.
You choose to be the sheep. You've been fortunate to have the sheep dogs whom you've insulted (with your "everyone lost WWII" comment) to protect your butt.
You're a sheep begging to be bloodied and savaged by dogs and wolves.
Some of us don't buy into the "feel free to beat me" mindset that you extol.