At first, I saw the idea of going to Hell for comitting suicide as a way to stop people in real life from doing so, but then it hit me. Life is considered by many to be God's greatest gift, and committing suicide would be pretty much tossing God's gift away and being unthankful for it. In short, you go to Hell for committing suicide because you basically said "Fuck you! I don't like your present!" to the Lord by killing yourself.
The second possible reason is even simpler: "Thou Shalt Not Kill." Nowhere in that line does that exclude yourself. So, from a theological perspective, suicide is nothing more than murdering yourself.
How did the rumor get started that Drip killed his parents? The cops must have found his semen on their bodies and matched it genetically to the infant boy lying in his mother's intestines. Picture how that lab scene must have played out.
How exactly did a man living under a bridge convince the gas, water, and electric companies to give him their services, especially when he doesn't appear to have a job?
That arc isn't exactly completed yet. Wait until the inevitable Chekhov's Gunman moments before questioning what's up with a character. You never know when some huge revelation is gonna be dropped on us three arcs later.
How does Hell deal with souls from cultures with a completely different moral compass? It seems kind of harsh that a warrior-type raised his entire life to obey his master without question be sent to hell for something he was ordered to do. Like with Todd's orders, but with a lifetime of indoctrination behind it.