Imagine hanging someone just because they treated an abyssal's teeth.
Did they also kill off loli hime as well?
Hasn't been translated yet, but I'm pretty sure that... yeah. It definitely looks like it.
And also, I would have thought they'd keep him around. He's a doctor (dentist, yeah, but still) who worked on multiple types of abyssals. The amount of intelligence they could potentially get even from that would be something to jump on. It may be touched in the untranslated parts, but until that happens, it just seems like they decided to go straight to execution.