Psychology can be just as useful as chemicals. Humans are very predictable in many ways. Websites like reddit and facebook are literally controlled by intelligence services. Divisiveness is one obvious intention (which definitely makes people angry). Even on this website, certain views are simply expected, and everyone acts like they're so certain of everything.

You only need common sense to get mad at muslims.

I was actally thinking about the rising level of anger in this country. Its not natural. Maybe it’s something in the food