"Takes thinks casual" .. Not sure exactly what that is supposed to mean. Do you mean it doesn't take anything seriously? If THAT is the case, then .. That's something you are going to have to teach him .. especially when it comes to safety, paying attention in school, how he treats other people ... those kinds of things.
He should be casual he's only 8. You don't want him stressing at his age or you'll end up with totally stressed out teenager and they have enough to stress about. He fine, just let him be a kid, they grow up so fast anyways