Zealot speech in public transportation

After I got on the train I could hear some body's voice. The voice was blunt and loud. Soon after listen few seconds I realize he was a zealot. They are more commonly seen in Seoul than crazy Los Angeles and freaky San Francisco. I could clearly feel how every bodies discomfort-being stuck in a train with a person doing loud, angry and irrational criticizing lecture. Absolute silence among others ;nobody say anything to the zealot. Somebody might say it's because of bothersome or he pity the man so he doesn't want to hurt the man or don't want to be embarrassed. Whether they ignoring the man or afraid of confrontation in public, no matter they variety the word, deep in down it's their fear, most of case. It is actually intimidating that guy on a wheel chair speaks to public with such a strong faith even though it is irrational faith. So people can not ease their mind. It seems I was the only one be able to look at the zealot man directly. He was also looked at me while he speaks, so I thought 'regardless of context, his speech is well flowing, this can be example for Korean listening lesson for the student that I teach.' It was funny idea and I giggled myself a bit. Then I pulled out and start recording. But soon, the zealot saw me recording him. He turned around to opposite side, HA!! "Are you serious?"