Being insane is defined as an inability to accurately perceive reality. I think you have used the wrong language to describe how most people are not good people. I have to disagree to a certain extent, the majority of people don't do the things you mentioned they are rare occurrences and grouping the majority of people into a category of "insane" because a small minority of people do deeply evil things is unwise and will lead you to develop a false sense of superiority something that meditation is supposed to eliminate. Most people are moderately bad people that will function so long as society supports them, but relative to the evil you're describing they're saints.