It really is this simple, and that is likely the reason. Unless you've dealt with something like this firsthand it really doesn't "click". There is the pervasive romanticization about drug addicts being downtrodden people who just needed a handout that never came, "how come none of (D-list celebrity)'s so-called FAMOUS friends helped him/her?" Well, they probably did try to help, but people who are strung out and addicted to meth and shit like that are pretty much beyond help. You can't just give them a stack of cash so they can pay their rent and bills because, guess what, none of that money will go to those things. They will spend every cent of it on drugs. Guaranteed. "Oh but this will be different." No, no it won't. It is never different. It plays out like this every single time.
People who are close to addicts either by blood or because they are long-time friends do try to help, but addicts are shitty and twisted people whose lives have fallen apart because they made the decision to fuck everything up and they consistently refuse to make the one smart move - get fucking clean - that will go a long way toward making things right again. We do try to help addicts, and they either throw it back in our faces or take advantage of our goodwill and that's why something like this happens every single time. I've had to cut people out of my life that I'd known for literal decades because they simply did not want to be helped in a way that would actually benefit them, they just wanted to be helped so long as "be helped" meant "help me get my next fix".
There is a very good reason someone as noteworthy as Joss had ZERO people who were willing to help him. There's a reason he was intentionally excluded from the convention panel mentioned earlier in this thread. There's a reason why his house caught fire multiple times. There's a reason why his neighbors fucking hated him. And there's a reason why he lived in one of the shittiest parts of San Antonio. He burned every bridge he ever had. That's why.