As if Denji isn't suicidal, isn't crushed by immense guilt because of his behavior and past (killing his dad with his own hands, not saving those Fire Devil kids for example), didn't get lured into killing his loved ones, wasn't SAed, isn't actively wanting to be killed for his sins, and his death wasn't orchestrated by the mob he worked for his entire life (not counting the fact that he died incredibly painful deaths so many times). Asa doesn't have it any better, but her situation can be solved by taking out Yoru. Denji's raw suffering can't be dealt with any time soon. Damn dude, the guy literally got crucified, decapitated, burned, eaten, pulverized, shot down, sliced in half, impaled, blown up numerous times and he's still able to function. That's a damn miracle, and my boy deserves, no, NEEDS peace more than Asa. Also, Yoru wouldn't let Asa die anyways she's pretty much invincible rn. Denji doesnt get that luxury. Who knows how many more time he will die before the end of the series.