A lad I went to school with ended up in an altercation one night after getting physical with someone having a go at his girlfriend.
It was his first offence but the judge made an example out of him and sent him down for a few months.
He couldn't handle it and got hooked on heroin in jail when he'd had no previous experience with drugs.
Since then, after starting out with a GF and a good job he'd been holding down for several years, he's been an addict in and out of prison.
What I'm saying is that circumstances can change, people end up in situations for different reasons and some can handle them whereas others cannot.
There's usually a story and a reason.