I think it's fairly common... most people don't care that dinosaurs were extinct. Most people also don't care if some currently existing species were to becom

I think it's fairly common... most people don't care that dinosaurs were extinct. Most people also don't care if some currently existing species were to become extinct, unless it's a species that affects human life (food, or necessary predator). Of course the environment is really complicated and nobody really can predict how one species could affect another, but clearly the extinction of dinosaurs had no ill affect on human life.