I'm Just Saying

"De-extinction or resurrection biology is an idea that involves bringing back species from the dead with the help of cloning. Although dinosaurs wouldn’t be good candidates, because their remains are so old and their DNA so degraded, woolly mammoths have been discussed as a possible contender." (Taken from Yahoo News)

Why bring mammoths back to life? For what reason or purpose would this benefit us or the rest of this planet? Why can't we just let things be and be satisfied with that?