Everybody crying about how he didn't take the easy way out, sorry the hot blooded war hero in this shonen manga didn't do the minmaxed MMORPG build choice. I sure hope you all were appreciating him as a character and not just using him as some sort of Isekei self-insert.
After everything he's seen of Melra, and everything that he's starting to realize might have gone wrong the first time explicitly because of her attempts to "help," his answer makes sense, even if it's not the one I probably would have made. I would have probably asked for some exposition and then told her to stop trying to help because her help isn't helping, instead of the flat-no Chaos path from Shin Megami Tensai, but then I'm not Kail and I respect that. And Kail's answer was definitely the shonen protagonist 'take a third option' answer to that question of a wish, and I respect that too. Some of you autists need to grow up. And Melra's not "stupid," she's just biased, as I'm sure the elven and dwarven gods are also biased, and you're all a bunch of clowns for still trying to parse some kind of argument about racism into this, especially after the revelation we were just given, where all the gods accidentally broke the first world. Sorry one of the moms never really got over it, maybe you should give your own mothers a phonecall and let her know that you still love them.
The only plothole in this is that Cairis didn't really explain why Melra can interfere if the gods supposedly can't interfere, or why Cairis can show up and talk right now. But just because she didn't explain it doesn't mean it's a plothole, it just means we don't currently have an answer to that question, and in-context that's fine, because that answer isn't something Kail needs to know. Since gods make people explode if they possess them for too long, her not going into pointless and unnecessary exposition (from Kail's perspective) makes sense. He doesn't need to know so she didn't bother to tell him. It's not important.
The real takeaway here that almost nobody has noticed is that we were handed another piece of the puzzle as to what's gone wrong with this world. Namely, we have a potential place this new and strange Demon King came from. He's probably from the old world. He seemed to come out of nowhere because he literally did come out of nowhere, and he was able to upend the balance of the world because he knows secrets and has magic that don't exist in this one. He might also still be another time traveler like Kail, and I won't discount that, but the "from the old world" theory is also a strong contender now. Especially since Cairis didn't bother to explain any of the questions Kail asked, but DID tell him about the other world, which means, if we put extra weight onto her choice of topic given her limited amount of speaking time, means that this other world is probably the root of this world's problem and the origin of this Demon King.