Almost all of us get "angry" about almost any disagreement, but the degree may be so mild that we often do not view them as getting angry. But if you are carefu

Almost all of us get "angry" about almost any disagreement, but the degree may be so mild that we often do not view them as getting angry. But if you are careful, you can see the emotional reactions for example in facial micro gestures. So why does almost everybody react to almost all of such challenges? Humans must have an "organ" (let's call it that, it is not actually physically a seperate organ) for keeping our world view constant. Think about it: if we did not have constant world view, we would be unable to operate in the world, even to lift a glass of water to drink it -- because the next moment we would not know what this object we have in our hand is. So such an organ is necessary for us to be able to function in the world. We can call this "organ" the ego. Our world view consists of various kinds of beliefs. We could say that each belief has an associated valency -- i.e. how strongly we believe in it. When we learn something, initially we assign high valency to the belief -- this is essentially the Dunning-Kruger effect. Everybody knows that somebody who has just converted to a belief (such as any -ism or religion) is the most vocal proponent of it. Over time, when we encounter things that challenge our beliefs, we may start questioning our beliefs or our beliefs may become stronger. What happens depends on multiple things. For example, how we encounter things that challenge our beliefs. It is easiest to swallow something if somebody is "feeding us with a small spoon". Also, our mental state when we encounter challenges to our world view has a huge impact. Our personality has an impact as well.