I'll give you an alternative viewpoint from someone who has close hand and very personal experiences with people who are self destructive (Alcoholics).
"the road to hell is paved with good intentions"
Being kind to people who are self destructive only serves to enable them. Alcoholics often are a victim of the enablers as much as themselves. In AA treatments, they look to find who the enablers are. Those who make excuses for the alcoholic, take away their pain, stop them from falling too hard to such an extent that they never get to hit the floor. It's only the harsh reality of the bottom that can save an alcoholic.
"They haven't suffered enough" is a phrase you'll here between alcoholics on both sides of the recovery.
"Don't help those who don't look for it" is another saying.
Jack doesn't need a soft mattress to keep him from hitting the floor. He needs to hit that floor hard enough that it wakes him up. The only way Jack can rise is by reaching the bottom and people who keep putting soft barriers infront of him to stop him reaching his bottom are only serving to delay that fall, sometimes until it is too late.
I don't think we're particularly disagreeing, to be honest. My complaint was more about making unsubstantiated accusations than anything else.
We all have our own experiences of these sorts of behaviours, whether in ourselves or others, and these colour our attitudes towards it.
Addiction was never a problem of mine (and we don't really know for certain that that's Jack's problem either - abuse and addiction are connected but separate concepts and we don't have the evidence to say that he's an alcoholic. Only that he seems to be having some struggles in his life and that appears to be coinciding with an increase in drinking).
But I've been as self-destructive as it's possible to get and I know that recovery comes from within and that the amount of help you can give someone who doesn't want to be helped is minimal.
My experiences mean that when I see someone acting like this I assume it's a mental health hole, because I see the evidence that is available to us and it reminds me of myself at my worst. Other people will look at it and be reminded of some other problem of their own or someone else's. So my opinion is biased by my experiences just as yours will be.
I think there are practical things that the people who are supposed to be taking care of him should be doing. You can't stop whatever's going on in his head and you can't make him seek help for it if he's not ready to. But you can keep him out of the public eye in order to not have the footage and criticism of him plastered all over social media, which is only going to make things worse.
At the moment he looks unwilling or unable to act in his own interests, so someone else has to. Whether it's his apparently close and loving family, any of the many people he probably pays a shitload of money to to help manage his life, or the club as his employer with a vested interest in both his health and his public persona.