if allah were to punish men according to what they deserve. he would not leave on the back of the a single living creature but he gives them respite for a stated term when their term expires verily allah has in his sight all his servants.
ولو يؤاخذ الله الناس بما كسبوا ما ترك على ظهرها من دابة ولكن يؤخرهم إلى أجل مسمى فإذا جاء أجلهم فإن الله كان بعباده بصيرا