One thing

There are times where one thing/instance can change your entire perspective on something. It could be the moment your dominant eye switched eyes, the time you realized that fish is actually delicious, or the instant you fully comprehended how great of a guy I truly am.

It's true that you don't want to pass judgment on something based on one event. That would not make this world at all interesting. Everyone has their particular explanations for what they do. Sometimes discovering a single fact can change your entire perspective. Just once, I want to ask someone who catcalls strangers why they do it or ask people who put toilet paper in the wrong way why they do it (The correct way is dispensing from the top, over). 

Everyone has little intrinsic life details that may be hidden to an outsider (and may cause confusion). For example, I tend to avoid eating original Cheerios because there was one time where I ate stale Cheerios with most likely spoiled milk, but Honey Nut Cheerios are perfectly fine. While my example is only exposed a few times a year, there are certain behavior/habits that are more common/significant that don't have an typical explanation.