Have you ever looked back on something you did and wondered, "What was I thinking?" For me, it's when I see photos from my teenage years. Every time I go through them, I ask myself, "Why did I choose that hairstyle? Did I really think this was cool?".
The fact is, at that time, it was cool. I liked the hairstyle of my favorite soccer player, and because of that, many kids in my school also had the same hairstyle. Therefore given the information and context I had, I made decisions that made sense. When others see the picture in my absence they might not understand the context because it's in my head.
In summary, some decisions are sensible if you understand the context. Context is KING.