You are showing maturity and compassion...we do not have to like what people do...and sometimes (perhaps) it is the best they think they can do- but we (perhaps) can see what they cannot. There is no doubt drinking makes any problem worse....especially as it is not just the abuser of booze who is hurt.
Only years after his death (from drinking at 41) can I understand my bro and my dad (also an alcie) better and with a little compassion. I once told my dad 'I love you Dad- but I do not like you '.
Support to you.