The Reality of Time Travel Paradoxes

The reality of time travel paradoxes is that I can explain it to most people, which I’m wondering at why I get this stuff while average people do not necessarily understand it. For example, Back to the Future, the first movie was about Marty McFly changing his family’s history. He has to get his parents together or he will never be born. He gets into his dad’s bedroom playing an evil man from outer space. When he gets back to his own time, he finds his dad is an accomplished writer. His parents in the other timeline were alcoholics, who had not accomplished much. But Marty changed the future. There I go, explaining a time travel paradox. Time travel is risky business.