Yeah I'm only going down the path of even partially blaming an organization when you find out they're complicit somehow, i.e. something like the Tyler Skaggs situation in MLB, where he had like trainers getting him opioids.
There's a strong possibly that nobody inside the organization, maybe save for a player or two who were close friends with him, had any idea he had a problem or even used.
As others have mentioned, statistically, there's people you associate with on a daily basis who are drug addicts, alcoholics, etc., and you'll never have a clue until something happens. Friends, Co-workers, family, etc.
I'm sure others have worse stories than this, but one of the Groomsmen in my wedding has been in and out of rehab for like 2 years now. I grew up with him, lived with him for a few years, talked all the time. We moved away and didn't speak as often later, but I knew pretty much everything about him for like 25 years, and not once did I ever see him do anything other than drink and smoke weed (which he didn't even do much of that).
Got a call two years ago from my Best Man telling me he'd been a heroin junkie for several months and they were checking him into rehab that morning. He'd been abusing Vicodin, Percocet, and various other pills since late in high school. Did an internship at a pharmacy for two years, got access to everything. Didn't see any signs of it or notice it for at least 15 years. Like pretty much everybody else, he couldn't afford the pills anymore, so he went the cheaper route.