I was once fucked over royally at a point in my life. After that let's say I had the opportunity to royally fuck over that person as well and expose the bullshit that happened.
But during that time I was in a weird place. I told myself that if I hope for the ill of other how can I expect good for myself.
I moved on and things played out well enough for me later on.
Some people do have that mindset as well.
Yeah in my opinion that's a shit mindset. Like I said in the comment you replied to: if you have the opportunity to make somebody's wrongdoings at the expense of other people known and choose not to do so, you're not taking the higher road or some shit, you're just actively increasing the chance that they fuck over somebody else since they got away with it. It's one of those things that makes people feel like they're morally superior, when in reality they're just perpetuating the issue. But in my experience, those sort of people rarely care as long as it's happening to somebody else. "Even 100 lashes are easy when they land on somebody else's back" and all that.
In my opinion there are only 3 reasons to cover up somebody's actions like that, none of them good;
1. you genuinely don't care about it happening to other people, as long as it doesn't happen to you,
2. you're a coward who just doesn't want to face the potential heat that may come with exposing it,
or 3. you're just an idiot who can't even think far enough ahead to see the possible consequences of your own inaction.
Edit: this didn't click when I first read your comment, but this sentence kinda supports my opinion: "I moved on and things played out well enough
for me later on". Great, it all worked out well for you. What about other people? Your unwillingness to reveal what that person did to you may lead to somebody else trusting them in the future and being fucked over in the exact same way. Does that not bother you at all?