Interruptions

It's funny but in my youth I don't think I ever consciously noticed people interrupting each other in conversation . Sadly I don't think I was ever really aware of interrupting others. Now I find I'm acutely aware of various interruptions, but not entirely in a disapproving way. Rather the phenomenon has a fascination about it. What is it that makes some people incapable of hearing others out? And the fascination is doubled in the case of those curious presenters you see on tv who thrive on asking people questions with a glorious unconcern as to their answers. Why ask someone what they think when you don't actually want to know?