It's not about morality, but about removing potential threats. Beyonders of the Abyss pathway are completely unpredictable. Maric also believes in temperance, which is basically the complete opposite of the Abyss pathway that indulges in their desires.

I don't know what the problem is, but if you formulate your question better then I'll try my best to explain

You misunderstood what Coldblooded means, it means to have no conscience, and not to have no feelings, they still have feelings and desires. And yes you're right in this case Abyss Pathway Beyonders would lose all morality and indulge in their desires, they have one of the highest if not the highest risk of losing control out of any pathway.

Well, I believe that he has some similarities to Fang Yuan, but Fang Yuan always had his goal of immortality and didn't necessarily like to play with his victims. Arthur has no real goal, currently he just wants to have his own very twisted version of fun, though they are relatively similar in terms of manipulating everyone around them.

Of course they will; that's the fun part. Arthur likes to play games with people, especially when he knows far more than they do. Them recognizing the name will just bring immense excitement to him.

Not my artwork.