Scott definitely has a reputation as a womanizer and a drinker, and that's per Travis Beacham. But no, NO ONE OFFICIAL has ever came out and said what it was he did that threw Herc out of the Drift and got him discharged. No confirmation whatsoever that it was rape and/or murder and/or child abuse of any sort. That's totally a fanon thing. And yes, you're right that if it HAD been one of those, Scott would have been brought up on criminal charges instead of just being quietly discharged.
So I say make of it what you will. Me personally? I think it was either drug related (which would be understandable given the situation and if Scott was higher than a kite while dropping, that would probably be enough to set Herc off) or - and yes, this one's a stretch - he had some sort of mental breakdown and just couldn't handle it anymore and wanted out, so Herc lied and gave him that out.
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I've got a handful of unanswered asks in my inbox from seven years ago that I probably will not tackle but I had to post this one because REALLY like the idea here that Herc got Scott kicked out because Scott couldn't handle being a Jaeger pilot and not because Scott did something bad. Maybe he turned to drugs to deal with the pressure (which of course would affect his performance), maybe he was fraying mentally, maybe he was able to admit there was a problem or maybe he wasn't. Of course this still leaves room for bad blood between the brothers and a sense of betrayal that might still go both ways.
And then Chuck, from drifting with Herc, could of course know the real reason.
