this was because their messengers would come to them with clear signs but they would say shall mortals guide us to the right way? they rejected the truth and turned away. thereupon allah became unconcerned with them for allah is selfsufficient innately praiseworthy.
ذلك بأنه كانت تأتيهم رسلهم بالبينات فقالوا أبشر يهدوننا فكفروا وتولوا واستغنى الله والله غني حميد