I'm on the verge of dropping this manga. While I don't particularly mind the "ecchi," that plus the "loli" is starting to bother me (doesn't matter if is supposed to be "legal-loli" or "loli-baba"). I mentioned it elsewhere and won't go into it here, but in short, it's more of an annoyance than anything else. And it's just getting worse with each loli mange/ln/wn.
I'd assume its a mix of desperately holding onto the "MC think's he weak but is actually overpowered!" trope and the author just forgetting that blowing up a moon was a thing he wrote early on.
This is a flimsy excuse for hentai-type of isekai. Don't take the characters or world too seriously. Or seriously at all, it's a huge fucking joke.
That said, I'm sure the reasoning would be that the human is considered a threat to all established authority and power, and has a small army of monsters. Monster army led by world-shaking titan of mythological godly power whose body is worth more than continents = Quick, kill 'em now, he's right in our backyard, can't have something that strong in our area that we don't control otherwise we can't be said to actually control our own territory or protect our people. Plus, if we suck on his toes we'll get superpowers.
While you’re right on all parts, I always take what I’m reading 100 percent seriously. Do I regret it half the time? Absolutely, but it’s part of who I am
Also yeah, logic seems to be non existent in these types of manga