What major crime was Joe told of? What major crime did MM witness? Truth is, MM didn’t witness much of anything (his words). He heard sounds.
The OAG can twist that into anal rape all they want (and they did). That doesn’t make it true, and MM called them on it.
What he told Joe, Curley, and Schultz is still unknown and will hopefully be revealed in the GS/GS/TC trials (going on 3 years now) if they ever happen.
But apparently you were there and know exactly what MM told Joe.
Let's accept that as being so for the moment. I say that with some skepticism because MM is not, in my opinion, a decent or reliable person. I have no idea how much he has twisted things one way or another.
So let's assume that JP witnessed nothing, and MM witnessed nothing. And let's assume MM only told something JP vague; that an attack on a child might be occurring.
My goodness, what would the average person do! I'd being jumping out of my chair to investigate! And I just might be carrying a baseball bat.
And if I had a pretty good idea of what I'd find, I'd be telling someone near to me to call the police. An attack on a child is like a house on fire. You've got to do something, and fast.
But I tell you one thing I wouldn't do. I wouldn't be sitting at my desk looking for my supervisor's phone number.
None of this makes JP a criminal, or evil. But it does make him a weak and unethical person, at least in this incident.