Furano has literally no logic behind that. That was seriously one of the dumbest interactions I have ever seen.
"I don't agree with your way of doing things" & "Your investigation and reasoning require someone to die"
It isn't his way. The person is dead regardless. He doesn't require shit. That's like saying a normal cop is wrong for solving a murder because "it requires someone to die". Seriously, that was some dumb shit. Acting as if he is somehow the bad guy or murdering people to solve mysteries. How stupid.
I never said this, but even this title doesn't make sense. He just has an extra clue. He's not a "fake detective", a fake detective would be solving fake crimes or already know the entire story behind the crime. Knowing who killed who doesn't solve a mystery. Nor does it make him somehow a false detective. He's just got a ridiculous advantage.