It'd be one thing if people recorded things like these for the purpose of law, justice, what-have-you, but it only ends up on the Internet under the title "RAGING BUS DRIVER BEATS DA SHEEYIT OUT OF LADY". In both videos, neither situation started off violent until one party did something stupid (i.e. get physical) to the other one, and then the situation degenerates from that point on. There's nothing wrong or potentially harmful if somebody can try to intervene before it reaches the point of no return and try to amend things, whether it's with dialogue or just by removing somebody.
Unfortunately, people seem to purely enjoy spectacle, even in a situation where there's no need for it. I just find those videos uncomfortable and embarrassing to watch.