This behavior is like when you are drowning, he rescues you to the shore, waits for you to regain your vitality, and then pushes you into the cold water with his own hands.
The dearest person may be the mastermind behind pushing you into the abyss.
When you arrest them for committing a crime, they don't suddenly wake up or feel grateful to you, but they want to tear you into pieces for destroying "good things".
Even if we know the outcome, out of our duties and obligations, we have no reason to let criminals go unpunished - we are needed here.
This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.