I have done those kinds of things. Sometimes it works out well, sometimes it does not. Sometimes it works out great.
I witnessed a guy arson his car for the insurance. At the time, I did not know that was happening. I just reported the fire.
Then, they took me to the police station to identify the guy.
Not like the movies at all. They just brought me into the room with the guy right there and asked me, in front of him, if that was him.
I said yes. Definitely not a safe way to do that.
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I was driving home in winter. I saw some kids on a bridge drop something. It hit the windshield of the car in front of me. There was an explosion of glass...and some of that hit my windshield.
I was quite angry...
I floored my car to find those kids...because they could have easily killed the driver in front of me. I caught up to them on a local highway where the police already had them in custody. And I told the officers what I saw and identified one of the kids.
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My job at the time, was a driver. I was on the road most of the week. Saw all kinds of things. Reported a lot to the police.
Personally, I really don't like the feeling of "playing police officer" or whatever you would want to call it. Not something I like...at all.
And if you do that stuff enough, sooner or later you will cross a line...and a dangerous one.
You will wind up not interacting with some regular person who has done some wrong...but with a professional criminal. And if you testify against someone like that, you could easily lose your life.
So, the whole subject is quite difficult. It's not a one way street. The people you report can easily get vindictive and come after you.
To this day, I really have no clue how to resolve the issues.
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oh, another example. So, by the way, I am a relatively big guy. I am 6 foot and 200 lbs. One of the things that happens to big guys...is that if there is some kind of fight going on...people will directly look at you and expect you to step in and stop things. And I have done some of those things. I used to book a blues band and was the bouncer at my own shows (saved money). So, I have learned things about de-escalating situations. But still, you never know. You can be as well intended as possible and things still go horribly wrong.
So, I was at this college library, in the hallway, making photocopies. It was relatively secluded. This couple comes into the hallway. The guy is clearly a football player. Now, I am big, but this guy was bigger. Much bigger. Plus, I assume he was actively bench pressing at least 350. So, he starts to mess around with his girlfriend. Then he starts to "play wrestle" her or something. And then IT happened. And by IT...I mean, I watched as this guy turned and went into a full blown steroid rage.
He started choking her!
Now it is just the three of us in that hallway, no one else can see what is happening.
And I realize, if I don't do something...who knows, this guy is doing to kill her...or, well, at least do plenty of harm.
So, I realized, I guess, that my duty was to intercede and get the living daylights beaten out of me. And just as I started to move toward him, to see what I could do...just as soon as the rage started...it faded away. And I was spared a beating.
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Like, I said, I have been in some of these incidents. Still have no clue what is the right thing to do.
Maybe some professional police sources have written about this subject and have professional advice.