They have God complex and think they know better than AllahFoolish words. Allah misguided them for a reason. The punishment of hell is for the righteous to stay righteous and for the criminals to burn. Who are you to question your creator and maker. Do you actually seriously believe you can understand Allah. I mean Allah has infinite knowledge and who would actually restrain from desires if hell didn't exist. No one, that's who. But indeed Allah is the most merciful as he let's the disbelievers enjoy their life and he feeds them and more but instead you don't see this part of it. Indeed Jahannam is for the disbelievers who have chosen desires over their Lord.
one of the reasons people go jahannam is for denying parts of the religion because it doesn't match their desires, they think they know better than Allah, it is a fitting punishment for arrogant peole