Umm. Nobody said you have to keep toxic alcoholics in your life. Just that it is a disease. Just like not all people with mental illnesses, which are also diseases, are toxic.
This board has supported people who chose to cut off alcoholic parents in the past.
Acknowledging something is a disease which needs medical treatment is different from obligating someone's kids to be the ones who procure such medical treatment for the parent or forgive a lifetime of bad behavior by the parent.