They generally don't hand out serious felony convictions for minor little reasons or simply making, "bad choices".
To receive a felony charge, and be convicted of a felony, generally means you were involved in a serious crime.
I provided on example above. In another case, a 16-year-old got drunk and killed someone. That is a seriously bad action, but not necessarily indicative of an evil person. Now he’s I think 21, and they accepted him into the military. He’s not a career criminal.
Several of the cases they mentioned had sex with minors when they were minors themselves, but in states where they violated the statutory rape laws (like a 16-year-old having sex with a 15-year-old). Again, a bad act, and they paid for it, now they are older, have served their sentences, and there is no indication that their bad act was a sign of inherent evil.
You don’t think that in the nation of a million 18-21-year-olds, there can’t be 250 who were convicted of felonies but aren’t hopelessly criminal.
I imagine there are more than a few who were convicted of drug offenses. I don’t condone drugs either, but I believe that there were more than a few drug users in the army even back when we had a draft.