this is because their noble messengers used to bring clear proofs to them in response they said what! will humans show us the way? they therefore became disbelievers and turned away and allah acted independently and allah is the independent the most praiseworthy.
ذلك بأنه كانت تأتيهم رسلهم بالبينات فقالوا أبشر يهدوننا فكفروا وتولوا واستغنى الله والله غني حميد