Who understand motive of some criminals and grant some criminals's private requests like Holmes and Poirot? Among detectives all.?

G K Chesterton's Father Brown

(If I have understood your question.)

A lot of your "Hard Boiled" P.I.s are known to look the other way in some cases. It is part of the "life is not always so pretty and clean."

Philip Marlowe in "The Big Sleep" for example.

Sam Spade in "The Maltese Falcon."

Then you have the whole Mickey Spillane group.

I'm sorry, but your English isn't good enough for you to ask such a question.

Try asking again in a simpler way?