"... it could be," Albus said. "But the thing is - the Hadeans who were looking wanted to have that someone or something destroyed and they offered Abyss cores for any information." Even if this member of royalty had murdered someone, Hadeans just-- weren't into capital punishment. Even from the brief interactions Aheals and Hadeans had, that bit was very obvious - it was against Hadean values to kill their own people regardless of how heavy were their crimes. Hadeans had a similar kind of immortality to Aheals and shared similar values on how to treat life and what atonement looked like. They could peacefully arrange their deals exactly because they had this common value.
