Alcoholism is really an allergy for many of us. There are people who are incapable of drinking in a healthy way. It's physically impossible.
It's nobody's fault. Not even the one who has to deal with the allergy.
There's no safe way to drink if you have that allergy. Full stop. One drink, and the allergic reaction kicks in. It can take years to dig out of the resulting mess.
It seems like he has some issues outside of his allergy, but having an extended chat with Howard Stern doesn't seem like a smart thing to do no matter how one lives. Nothing good can come of it.
I met Jennifer Garner just before she did that spinoff of Party of Pain or whatever it was called. She was very cool, I thought. She was dating a guy I hired. He doesn't get any press though, lol.