Its mesirah to call the police for anything involving another yid unless there is real sakanas nefashos like if hes attacking you right now.
I actually once called a cop to quickly adjudicate a case where someone* stole something from me. I was able to pretty quickly prove that it was mine, but he wouldn’t surrender it until the cops forced him to.
While I didn’t press charges, I guess I am a moser according to the definitions above. I called the cops and I wasn’t in any physical danger.
So, for all those who feel its a mitzvah to kill a moser, come and get me.
The Wolf
* Yes, it was a Jew.