Anger is an acid that can do more harm to the vessel in which it is stored than to anything on which it is poured.
A reversal is just anything that's a surprise. It's a way of keeping the audience interested.
I mostly write about the working poor. Somehow, they're not being written about much anymore. I'm very interested in people who are in a situation that needs a little puzzling out. The thing that gets me started on a story is a person in a tough situation.