In a way you're right, but what you can do comes from a significantly high spiritual development level. For an average Joe it's quite abstract and maybe even unattainable in this life.

OTOH, there are people who get sensory overstimulated more easily. Add to that a foreign place, lot of people and chaos around, and even a neurotypical individual can feel anxious.

Putting on headphones and playing Chopin is much more effective than breathing and telling yourself "everythings gonna be ok" in a loop. At least in my experience.

I believe we wouldn't have a tenth of the chaos we are currently experiencing if people talked to their neighbors and fellow commuters more.